{{Interventions infobox | Name = Magnetic resonance imaging | Image = MR Knee.jpg | Caption = Sagittal MR image of the knee | ICD10 = B?3?ZZZ | ICD9unlinked = - | MeshID = D008279 | OPS301 = | OtherCodes = | }} Magnetic resonance imaging (MRI), nuclear magnetic resonance imaging (NMRI), or magnetic resonance tomography (MRT) is a medical imaging technique used in radiology to visualize detailed internal structures. MRI makes use of the property of nuclear magnetic resonance (NMR) to image nuclei of atoms inside the body.

An MRI machine uses a powerful magnetic field to align the magnetization of some atoms in the body, and radio frequency fields to systematically alter the alignment of this magnetization. This causes the nuclei to produce a rotating magnetic field detectable by the scanner—and this information is recorded to construct an image of the scanned area of the body. Strong magnetic field gradients cause nuclei at different locations to rotate at different speeds. 3-D spatial information can be obtained by providing gradients in each direction.

MRI provides good contrast between the different soft tissues of the body, which makes it especially useful in imaging the brain, muscles, the heart, and cancers compared with other medical imaging techniques such as computed tomography (CT) or X-rays. Unlike CT scans or traditional X-rays, MRI uses no ionizing radiation.

How MRI works

The body is largely composed of water molecules. Each water molecule has two hydrogen nuclei or protons. When a person is inside the powerful magnetic field of the scanner, the magnetic moments of some of these molecules become aligned with the direction of the field. A radio frequency transmitter is briefly turned on, producing a further varying electromagnetic field. The photons of this field have just the right energy, known as the resonance frequency, to be absorbed and flip the spin of the aligned protons in the body. The frequency at which the protons resonate depends on the strength of the applied magnetic field. After the field is turned off, those protons which absorbed energy revert to the original lower-energy spin-down state. Now a hydrogen dipole has two spins, 1 high spin and 1 low. In low spin both dipole and field are in parallel direction and in high spin case it is antiparallel. They release the difference in energy as a photon, and the released photons are detected by the scanner as an electromagnetic signal, similar to radio waves.

As a result of conservation of energy, the resonant frequency also dictates the frequency of the released photons. The photons released when the field is removed have an energy — and therefore a frequency — which depends on the energy absorbed while the field was active. It is this relationship between field-strength and frequency that allows the use of nuclear magnetic resonance for imaging. An image can be constructed because the protons in different tissues return to their equilibrium state at different rates, which is a difference that can be detected. Five different tissue variables — spin density, ''T''₁ and ''T''₂ relaxation times and flow and spectral shifts can be used to construct images. By changing the settings on the scanner, this effect is used to create contrast between different types of body tissue or between other properties, as in fMRI and diffusion MRI.

The 3D position from which photons were released is learned by applying additional fields during the scan. This is done by passing electric currents through specially-wound solenoids, known as gradient coils. These fields make the magnetic field strength vary depending on the position within the patient, which in turn makes the frequency of released photons dependent on their original position in a predictable manner, and the original locations can be mathematically recovered from the resulting signal by the use of inverse Fourier transform.

Contrast agents may be injected intravenously to enhance the appearance of blood vessels, tumors or inflammation. Contrast agents may also be directly injected into a joint in the case of arthrograms, MRI images of joints. Unlike CT, MRI uses no ionizing radiation and is generally a very safe procedure. Nonetheless the strong magnetic fields and radio pulses can affect metal implants, including cochlear implants and cardiac pacemakers. In the case of cochlear implants, the US FDA has approved some implants for MRI compatibility. In the case of cardiac pacemakers, the results can sometimes be lethal, so patients with such implants are generally not eligible for MRI.

Since the gradient coils are within the bore of the scanner, there are large forces between them and the main field coils, producing most of the noise that is heard during operation. Without efforts to damp this noise, it can approach 130 decibels (dB) with strong fields (see also the subsection on acoustic noise).

MRI is used to image every part of the body, and is particularly useful for tissues with many hydrogen nuclei and little density contrast, such as the brain, muscle, connective tissue and most tumors.

History

In the 1950s, Herman Carr reported on the creation of a one-dimensional MR image. Paul Lauterbur expanded on Carr's technique and developed a way to generate the first MRI images, in 2D and 3D, using gradients. In 1973, Lauterbur published the first nuclear magnetic resonance image. and the first cross-sectional image of a living mouse was published in January 1974. Nuclear magnetic resonance imaging is a relatively new technology first developed at the University of Nottingham, England. Peter Mansfield, a physicist and professor at the university, then developed a mathematical technique that would allow scans to take seconds rather than hours and produce clearer images than Lauterbur had.

In a 1971 paper in the journal ''Science'', Dr. Raymond Damadian, an Armenian-American physician, scientist, and professor at the Downstate Medical Center State University of New York (SUNY), reported that tumors and normal tissue can be distinguished in vivo by nuclear magnetic resonance ("NMR"). He suggested that these differences could be used to diagnose cancer, though later research would find that these differences, while real, are too variable for diagnostic purposes. Damadian's initial methods were flawed for practical use, relying on a point-by-point scan of the entire body and using relaxation rates, which turned out to not be an effective indicator of cancerous tissue.

While researching the analytical properties of magnetic resonance, Damadian created the world's first magnetic resonance imaging machine in 1972. He filed the first patent for an MRI machine, U.S. patent #3,789,832 on March 17, 1972, which was later issued to him on February 5, 1974. As the National Science Foundation notes, "The patent included the idea of using NMR to 'scan' the human body to locate cancerous tissue." However, it did not describe a method for generating pictures from such a scan or precisely how such a scan might be done. Damadian along with Larry Minkoff and Michael Goldsmith, subsequently went on to perform the first MRI body scan of a human being on July 3, 1977. These studies performed on humans were published in 1977.

In recording the history of MRI, Mattson and Simon (1996) credit Damadian with describing the concept of whole-body NMR scanning, as well as discovering the NMR tissue relaxation differences that made this feasible.

2003 Nobel Prize

Reflecting the fundamental importance and applicability of MRI in medicine, Paul Lauterbur of the University of Illinois at Urbana-Champaign and Sir Peter Mansfield of the University of Nottingham were awarded the 2003 Nobel Prize in Physiology or Medicine for their "discoveries concerning magnetic resonance imaging". The Nobel citation acknowledged Lauterbur's insight of using magnetic field gradients to determine spatial localization, a discovery that allowed rapid acquisition of 2D images. Mansfield was credited with introducing the mathematical formalism and developing techniques for efficient gradient utilization and fast imaging. The actual research that won the prize was done almost 30 years before, while Paul Lauterbur was at Stony Brook University in New York.

The award was vigorously protested by Raymond Vahan Damadian, founder of FONAR Corporation, who claimed that he invented the MRI, and that Lauterbur and Mansfield had merely refined the technology. An ad hoc group, called "The Friends of Raymond Damadian", took out full-page advertisements in the ''New York Times'' and ''The Washington Post'' entitled "The Shameful Wrong That Must Be Righted", demanding that he be awarded at least a share of the Nobel Prize. Also, even earlier, in the Soviet Union, Vladislav Ivanov filed (in 1960) a document with the USSR State Committee for Inventions and Discovery at Leningrad for a Magnetic Resonance Imaging device, although this was not approved until the 1970s. In a letter to ''Physics Today'', Herman Carr pointed out his own even earlier use of field gradients for one-dimensional MR imaging.

Applications

In clinical practice, MRI is used to distinguish pathologic tissue (such as a brain tumor) from normal tissue. One advantage of an MRI scan is that it is harmless to the patient. It uses strong magnetic fields and non-ionizing radiation in the radio frequency range, unlike CT scans and traditional X-rays, which both use ionizing radiation.

While CT provides good spatial resolution (the ability to distinguish two separate structures an arbitrarily small distance from each other), MRI provides comparable resolution with far better contrast resolution (the ability to distinguish the differences between two arbitrarily similar but not identical tissues). The basis of this ability is the complex library of ''pulse sequences'' that the modern medical MRI scanner includes, each of which is optimized to provide ''image contrast'' based on the chemical sensitivity of MRI.

For example, with particular values of the ''echo time'' (''T''_E) and the ''repetition time'' (''T''_R), which are basic parameters of image acquisition, a sequence takes on the property of ''T''₂-weighting. On a ''T''₂-weighted scan, water- and fluid-containing tissues are bright (most modern ''T''₂ sequences are actually ''fast'' ''T''₂ sequences) and fat-containing tissues are dark. The reverse is true for ''T''₁-weighted images. Damaged tissue tends to develop edema, which makes a ''T''₂-weighted sequence sensitive for pathology, and generally able to distinguish pathologic tissue from normal tissue. With the addition of an additional radio frequency pulse and additional manipulation of the magnetic gradients, a ''T''₂-weighted sequence can be converted to a FLAIR sequence, in which free water is now dark, but edematous tissues remain bright. This sequence in particular is currently the most sensitive way to evaluate the brain for demyelinating diseases, such as multiple sclerosis.

The typical MRI examination consists of 5–20 sequences, each of which are chosen to provide a particular type of information about the subject tissues. This information is then synthesized by the interpreting physician.

Basic MRI scans

''T''₁-weighted MRI

''T''₁-weighted scans are a standard basic scan, in particular differentiating fat from water - with water darker and fat brighter use a gradient echo (GRE) sequence, with short ''T''_E and short ''T''_R. This is one of the basic types of MR contrast and is a commonly run clinical scan. The ''T''₁ weighting can be increased (improving contrast) with the use of an inversion pulse as in an MP-RAGE sequence. Due to the short repetition time (''T''_R) this scan can be run very fast allowing the collection of high resolution 3D datasets. A ''T''₁ reducing gadolinium contrast agent is also commonly used, with a ''T''₁ scan being collected before and after administration of contrast agent to compare the difference. In the brain ''T''₁-weighted scans provide good gray matter/white matter contrast; in other words, ''T''₁-weighted images highlight fat deposition.

''T''₂-weighted MRI

''T''₂-weighted scans are another basic type. Like the ''T''₁-weighted scan, fat is differentiated from water - but in this case fat shows darker, and water lighter. For example, in the case of cerebral and spinal study, the CSF (cerebrospinal fluid) will be lighter in ''T''₂-weighted images. These scans are therefore particularly well suited to imaging edema, with long ''T''_E and long ''T''_R. Because the spin echo sequence is less susceptible to inhomogeneities in the magnetic field, these images have long been a clinical workhorse.

''T''-weighted MRI

''T'' (pronounced "T 2 star") weighted scans use a gradient echo (GRE) sequence, with long ''T''_E and long ''T''_R. The gradient echo sequence used does not have the extra refocusing pulse used in spin echo so it is subject to additional losses above the normal ''T''₂ decay (referred to as ''T''₂′), these taken together are called ''T''. This also makes it more prone to susceptibility losses at air/tissue boundaries, but can increase contrast for certain types of tissue, such as venous blood.

Spin density weighted MRI

Spin density, also called proton density, weighted scans try to have no contrast from either ''T''₂ or ''T''₁ decay, the only signal change coming from differences in the amount of available spins (hydrogen nuclei in water). It uses a spin echo or sometimes a gradient echo sequence, with short ''T''_E and long ''T''_R.

Specialized MRI scans

Diffusion MRI

Diffusion MRI measures the diffusion of water molecules in biological tissues. In an isotropic medium (inside a glass of water for example), water molecules naturally move randomly according to turbulence and Brownian motion. In biological tissues however, where the Reynolds number is low enough for flows to be laminar, the diffusion may be anisotropic. For example, a molecule inside the axon of a neuron has a low probability of crossing the myelin membrane. Therefore the molecule moves principally along the axis of the neural fiber. If it is known that molecules in a particular voxel diffuse principally in one direction, the assumption can be made that the majority of the fibers in this area are going parallel to that direction.

The recent development of diffusion tensor imaging (DTI) enables diffusion to be measured in multiple directions and the fractional anisotropy in each direction to be calculated for each voxel. This enables researchers to make brain maps of fiber directions to examine the connectivity of different regions in the brain (using tractography) or to examine areas of neural degeneration and demyelination in diseases like Multiple Sclerosis.

Another application of diffusion MRI is diffusion-weighted imaging (DWI). Following an ischemic stroke, DWI is highly sensitive to the changes occurring in the lesion. It is speculated that increases in restriction (barriers) to water diffusion, as a result of cytotoxic edema (cellular swelling), is responsible for the increase in signal on a DWI scan. The DWI enhancement appears within 5–10 minutes of the onset of stroke symptoms (as compared with computed tomography, which often does not detect changes of acute infarct for up to 4–6 hours) and remains for up to two weeks. Coupled with imaging of cerebral perfusion, researchers can highlight regions of "perfusion/diffusion mismatch" that may indicate regions capable of salvage by reperfusion therapy.

Like many other specialized applications, this technique is usually coupled with a fast image acquisition sequence, such as echo planar imaging sequence.

Magnetization Transfer MRI

Magnetization transfer (MT) refers to the transfer of longitudinal magnetization from free water protons to hydration water protons in NMR and MRI.

In magnetic resonance imaging of molecular solutions, such as protein solutions, two types of water molecules, free (bulk) and hydration (bound), are found. Free water protons have faster average rotational frequency and hence less fixed water molecules that may cause local field inhomogeneity. Because of this uniformity, most free water protons have resonance frequency lying narrowly around the normal proton resonance frequency of 63 MHz (at 1.5 teslas). This also results in slower transverse magnetization dephasing and hence longer ''T''₂. Conversely, hydration water molecules are slowed down by interaction with solute molecules and hence create field inhomogeneities that lead to wider resonance frequency spectrum.

In free liquids, protons, which may be viewed classically as small magnetic dipoles, exhibit translational and rotational motions. These moving dipoles disturb the surrounding magnetic field however on long enough time-scales (which may be nanoseconds) the average field caused by the motion of protons is zero. This is known as “motional averaging” or narrowing and is characteristic of protons moving freely in liquid. On the other hand, protons bound to macromolecules, such as proteins, tend to have a fixed orientation and so the average magnetic field in close proximity to such structures does not average to zero. The result is a spatial pattern in the magnetic field that gives rise to a residual dipolar coupling (range of precession frequencies) for the protons experiencing the magnetic field. The wide frequency distribution appears as a broad spectrum that may be several kHz wide. The net signal from these protons disappears very quickly, in inverse proportion to the width, due to the loss of coherence of the spins, i.e. T2 relaxation. Due to exchange mechanisms, such as spin transfer or proton chemical exchange, the (incoherent) spins bound to the macromolecules continually switch places with (coherent) spins in the bulk media and establish a dynamic equilibrium.

Magnetization transfer: Although there is no measurable signal from the bound spins, or the bound spins that exchange into the bulk media, their longitudinal magnetization is preserved and may recover only via the relatively slow process of T1 relaxation. If the longitudinal magnetization of just the bound spins can be altered, then the effect can be measured in the spins of the bulk media due to the exchange processes. The magnetization transfer sequence applies RF saturation at a frequency that is far off resonance for the narrow line of bulk water but still on resonance for the bound protons with a spectral linewidth of kHz. This causes saturation of the bound spins which exchange into the bulk water, resulting in a loss of longitudinal magnetization and hence signal decrease in the bulk water. This provides an indirect measure of macromolecular content in tissue. Implementation of magnetization transfer involves choosing suitable frequency offsets and pulse shapes to saturate the bound spins sufficiently strongly, within the safety limits of specific absorption rate for RF irradiation.

T1ρ (T1rho): Molecules have a kinetic energy that is a function of the temperature and is expressed as translational and rotational motions, and by collisions between molecules. The moving dipoles disturb the magnetic field but are often extremely rapid so that the average effect over a long time-scale may be zero. However, depending on the time-scale, the interactions between the dipoles do not always average away. At the slowest extreme the interaction time is effectively infinite and occurs where there are large, stationary field disturbances (e.g. a metallic implant). In this case the loss of coherence is described as a "static dephasing". T2* is a measure of the loss of coherence in an ensemble of spins that include all interactions (including static dephasing). T2 is a measure of the loss of coherence that excludes static dephasing, using an RF pulse to reverse the slowest types of dipolar interaction. There is in fact a continuum of interaction time-scales in a given biological sample and the properties of the refocusing RF pulse can be tuned to refocus more than just static dephasing. In general, the rate of decay of an ensemble of spins is a function of the interaction times and also the power of the RF pulse. This type of decay, occurring under the influence of RF, is known as T1ρ. It is similar to T2 decay but with some slower dipolar interactions refocused as well as the static interactions.

Fluid attenuated inversion recovery (FLAIR)

Fluid Attenuated Inversion Recovery (FLAIR) is an inversion-recovery pulse sequence used to null signal from fluids. For example, it can be used in brain imaging to suppress cerebrospinal fluid (CSF) so as to bring out the periventricular hyperintense lesions, such as multiple sclerosis (MS) plaques. By carefully choosing the inversion time TI (the time between the inversion and excitation pulses), the signal from any particular tissue can be suppressed.

Magnetic resonance angiography

Magnetic resonance angiography (MRA) generates pictures of the arteries to evaluate them for stenosis (abnormal narrowing) or aneurysms (vessel wall dilatations, at risk of rupture). MRA is often used to evaluate the arteries of the neck and brain, the thoracic and abdominal aorta, the renal arteries, and the legs (called a "run-off"). A variety of techniques can be used to generate the pictures, such as administration of a paramagnetic contrast agent (gadolinium) or using a technique known as "flow-related enhancement" (e.g. 2D and 3D time-of-flight sequences), where most of the signal on an image is due to blood that recently moved into that plane, see also FLASH MRI. Techniques involving phase accumulation (known as phase contrast angiography) can also be used to generate flow velocity maps easily and accurately. Magnetic resonance venography (MRV) is a similar procedure that is used to image veins. In this method, the tissue is now excited inferiorly, while signal is gathered in the plane immediately superior to the excitation plane—thus imaging the venous blood that recently moved from the excited plane.

Magnetic resonance gated intracranial CSF dynamics (MR-GILD)

Magnetic resonance gated intracranial cerebrospinal fluid (CSF) or liquor dynamics (MR-GILD) technique is an MR sequence based on bipolar gradient pulse used to demonstrate CSF pulsatile flow in ventricles, cisterns, aqueduct of Sylvius and entire intracranial CSF pathway. It is a method for analyzing CSF circulatory system dynamics in patients with CSF obstructive lesions such as normal pressure hydrocephalus. It also allows visualization of both arterial and venous pulsatile blood flow in vessels without use of contrast agents.

! Diastolic time data acquisition (DTDA).	! Systolic time data acquisition (STDA).

Magnetic resonance spectroscopy

Magnetic resonance spectroscopy (MRS) is used to measure the levels of different metabolites in body tissues. The MR signal produces a spectrum of resonances that correspond to different molecular arrangements of the isotope being "excited". This signature is used to diagnose certain metabolic disorders, especially those affecting the brain, and to provide information on tumor metabolism.

Magnetic resonance spectroscopic imaging (MRSI) combines both spectroscopic and imaging methods to produce spatially localized spectra from within the sample or patient. The spatial resolution is much lower (limited by the available SNR), but the spectra in each voxel contains information about many metabolites. Because the available signal is used to encode spatial and spectral information, MRSI requires high SNR achievable only at higher field strengths (3 T and above).

Functional MRI

Functional MRI (fMRI) measures signal changes in the brain that are due to changing neural activity. The brain is scanned at low resolution but at a rapid rate (typically once every 2–3 seconds). Increases in neural activity cause changes in the MR signal via ''T'' changes; this mechanism is referred to as the BOLD (blood-oxygen-level dependent) effect. Increased neural activity causes an increased demand for oxygen, and the vascular system actually overcompensates for this, increasing the amount of oxygenated hemoglobin relative to deoxygenated hemoglobin. Because deoxygenated hemoglobin attenuates the MR signal, the vascular response leads to a signal increase that is related to the neural activity. The precise nature of the relationship between neural activity and the BOLD signal is a subject of current research. The BOLD effect also allows for the generation of high resolution 3D maps of the venous vasculature within neural tissue.

While BOLD signal is the most common method employed for neuroscience studies in human subjects, the flexible nature of MR imaging provides means to sensitize the signal to other aspects of the blood supply. Alternative techniques employ arterial spin labeling (ASL) or weight the MRI signal by cerebral blood flow (CBF) and cerebral blood volume (CBV). The CBV method requires injection of a class of MRI contrast agents that are now in human clinical trials. Because this method has been shown to be far more sensitive than the BOLD technique in preclinical studies, it may potentially expand the role of fMRI in clinical applications. The CBF method provides more quantitative information than the BOLD signal, albeit at a significant loss of detection sensitivity.

Real-time MRI

Real-time MRI refers to the continuous monitoring (“filming”) of moving objects in real time. While many different strategies have been developed over the past two decades, a recent development reported a real-time MRI technique based on radial FLASH that yields a temporal resolution of 20 to 30 milliseconds for images with an in-plane resolution of 1.5 to 2.0 mm. The new method promises to add important information about diseases of the joints and the heart. In many cases MRI examinations may become easier and more comfortable for patients.

Interventional MRI

The lack of harmful effects on the patient and the operator make MRI well-suited for "interventional radiology", where the images produced by a MRI scanner are used to guide minimally invasive procedures. Of course, such procedures must be done without ''any'' ferromagnetic instruments.

A specialized growing subset of interventional MRI is that of intraoperative MRI in which the MRI is used in the surgical process. Some specialized MRI systems have been developed that allow imaging concurrent with the surgical procedure. More typical, however, is that the surgical procedure is temporarily interrupted so that MR images can be acquired to verify the success of the procedure or guide subsequent surgical work.

Radiation therapy simulation

Because of MRI's superior imaging of soft tissues, it is now being utilized to specifically locate tumors within the body in preparation for radiation therapy treatments. For therapy simulation, a patient is placed in specific, reproducible, body position and scanned. The MRI system then computes the precise location, shape and orientation of the tumor mass, correcting for any spatial distortion inherent in the system. The patient is then marked or tattooed with points that, when combined with the specific body position, permits precise triangulation for radiation therapy.

Current density imaging

Current density imaging (CDI) endeavors to use the phase information from images to reconstruct current densities within a subject. Current density imaging works because electrical currents generate magnetic fields, which in turn affect the phase of the magnetic dipoles during an imaging sequence.

Magnetic resonance guided focused ultrasound

In MRgFUS therapy, ultrasound beams are focused on a tissue—guided and controlled using MR thermal imaging—and due to the significant energy deposition at the focus, temperature within the tissue rises to more than 65 °C (150 °F), completely destroying it. This technology can achieve precise ablation of diseased tissue. MR imaging provides a three-dimensional view of the target tissue, allowing for precise focusing of ultrasound energy. The MR imaging provides quantitative, real-time, thermal images of the treated area. This allows the physician to ensure that the temperature generated during each cycle of ultrasound energy is sufficient to cause thermal ablation within the desired tissue and if not, to adapt the parameters to ensure effective treatment.

Multinuclear imaging

Hydrogen is the most frequently imaged nucleus in MRI because it is present in biological tissues in great abundance, and because its high gyromagnetic ratio gives a strong signal. However, any nucleus with a net nuclear spin could potentially be imaged with MRI. Such nuclei include helium-3, carbon-13, fluorine-19, oxygen-17, sodium-23, phosphorus-31 and xenon-129. ²³Na and ³¹P are naturally abundant in the body, so can be imaged directly. Gaseous isotopes such as ³He or ¹²⁹Xe must be hyperpolarized and then inhaled as their nuclear density is too low to yield a useful signal under normal conditions. ¹⁷O and ¹⁹F can be administered in sufficient quantities in liquid form (e.g. ¹⁷O-water) that hyperpolarization is not a necessity.

Multinuclear imaging is primarily a research technique at present. However, potential applications include functional imaging and imaging of organs poorly seen on ¹H MRI (e.g. lungs and bones) or as alternative contrast agents. Inhaled hyperpolarized ³He can be used to image the distribution of air spaces within the lungs. Injectable solutions containing ¹³C or stabilized bubbles of hyperpolarized ¹²⁹Xe have been studied as contrast agents for angiography and perfusion imaging. ³¹P can potentially provide information on bone density and structure, as well as functional imaging of the brain.

Susceptibility weighted imaging (SWI)

Susceptibility weighted imaging (SWI), is a new type of contrast in MRI different from spin density, ''T''₁, or ''T''₂ imaging. This method exploits the susceptibility differences between tissues and uses a fully velocity compensated, three dimensional, RF spoiled, high-resolution, 3D gradient echo scan. This special data acquisition and image processing produces an enhanced contrast magnitude image very sensitive to venous blood, hemorrhage and iron storage. It is used to enhance the detection and diagnosis of tumors, vascular and neurovascular diseases (stroke and hemorrhage, multiple sclerosis, Alzheimer's), and also detects traumatic brain injuries that may not be diagnosed using other methods

Other specialized MRI techniques

New methods and variants of existing methods are often published when they are able to produce better results in specific fields. Examples of these recent improvements are ''T''-weighted turbo spin-echo (''T''₂ TSE MRI), double inversion recovery MRI (DIR-MRI) or phase-sensitive inversion recovery MRI (PSIR-MRI), all of them able to improve imaging of the brain lesions. Another example is MP-RAGE (magnetization-prepared rapid acquisition with gradient echo), which improves images of multiple sclerosis cortical lesions.

Portable instruments

Portable magnetic resonance instruments are available for use in education and field research. Using the principles of Earth's field NMR, they have no powerful polarizing magnet, so that such instruments can be small and inexpensive. Some can be used for both EFNMR spectroscopy and MRI imaging. The low strength of the Earth's field results in poor signal to noise ratios, requiring long scan times to capture spectroscopic data or build up MRI images.

Research with atomic magnetometers have discussed the possibility for cheap and portable MRI instruments without the large magnet.

MRI versus CT

A computed tomography (CT) scanner uses X-rays, a type of ionizing radiation, to acquire images, making it a good tool for examining tissue composed of elements of a higher atomic number than the tissue surrounding them, such as bone and calcifications (calcium based) within the body (carbon based flesh), or of structures (vessels, bowel). MRI, on the other hand, uses non-ionizing radio frequency (RF) signals to acquire its images and is best suited for soft tissue (although MRI can also be used to acquire images of bones, teeth and even fossils).

Contrast in CT images is generated purely by X-ray attenuation, while a variety of properties may be used to generate contrast in MR images. By variation of scanning parameters, tissue contrast can be altered to enhance different features in an image (see Applications for more details). Both CT and MR images may be enhanced by the use of contrast agents. Contrast agents for CT contain elements of a high atomic number, relative to tissue, such as iodine or barium, while contrast agents for MRI have paramagnetic properties, such as gadolinium and manganese, used to alter tissue relaxation times.

CT and MRI scanners are able to generate multiple two-dimensional cross-sections (slices) of tissue and three-dimensional reconstructions. MRI can generate cross-sectional images in any plane (including oblique planes). In the past, CT was limited to acquiring images in the axial (or near axial) plane. The scans used to be called Computed ''Axial'' Tomography scans (CAT scans). However, the development of multi-detector CT scanners with near-isotropic resolution, allows the CT scanner to produce data that can be retrospectively reconstructed in any plane with minimal loss of image quality. For purposes of tumor detection and identification in the brain, MRI is generally superior. However, in the case of solid tumors of the abdomen and chest, CT is often preferred as it suffers less from motion artifacts. Furthermore, CT usually is more widely available, faster, less expensive, and may be less likely to require the person to be sedated or anesthetized.

MRI is also best suited for cases when a patient is to undergo the exam several times successively in the short term, because, unlike CT, it does not expose the patient to the hazards of ionizing radiation.

Economics of MRI

MRI equipment is expensive. 1.5 tesla scanners often cost between and . 3.0 tesla scanners often cost between and . Construction of MRI suites can cost up to , or more, depending on project scope. MRI scanners have been significant sources of revenue for healthcare providers in the US. This is because of favorable reimbursement rates from insurers and federal government programs. Insurance reimbursement is provided in two components, an equipment charge for the actual performance of the MRI scan and professional charge for the radiologist's review of the images and/or data. In the US Northeast, an equipment charge might be $3,500 and a professional charge might be $350 although the actual fees received by the equipment owner and interpreting physician are often significantly less and depend on the rates negotiated with insurance companies or determined by governmental action as in the Medicare Fee Schedule. For example, an orthopedic surgery group in Illinois billed a charge of $1,116 for a knee MRI in 2007 but the Medicare reimbursement in 2007 was only $470.91. Many insurance companies require preapproval of an MRI procedure as a condition for coverage.

In the US, the Deficit Reduction Act of 2005 significantly reduced reimbursement rates paid by federal insurance programs for the equipment component of many scans, shifting the economic landscape. Many private insurers have followed suit.

Safety

A number of features of MRI scanning can give rise to risks.

These include:

Powerful magnetic fields

Cryogenic liquids

Noise

Claustrophobia

In addition, in cases where MRI contrast agents are used, these also typically have associated risks.

Magnetic field

Most forms of medical or biostimulation implants are generally considered contraindications for MRI scanning. These include pacemakers, vagus nerve stimulators, implantable cardioverter-defibrillators, loop recorders, insulin pumps, cochlear implants, deep brain stimulators and capsules retained from capsule endoscopy. Patients are therefore always asked for complete information about all implants before entering the room for an MRI scan. Several deaths have been reported in patients with pacemakers who have undergone MRI scanning without appropriate precautions. To reduce such risks, implants are increasingly being developed to make them able to be safely scanned, and specialized protocols have been developed to permit the safe scanning of selected implants and pacing devices. Cardiovascular stents are considered safe, however.

Ferromagnetic foreign bodies such as shell fragments, or metallic implants such as surgical prostheses and aneurysm clips are also potential risks. Interaction of the magnetic and radio frequency fields with such objects can lead to trauma due to movement of the object in the magnetic field or thermal injury from radio-frequency induction heating of the object.

Titanium and its alloys are safe from movement from the magnetic field.

In the United States a classification system for implants and ancillary clinical devices has been developed by ASTM International and is now the standard supported by the US Food and Drug Administration:

thumb|right|MR Safe sign ''MR-Safe'' — The device or implant is completely non-magnetic, non-electrically conductive, and non-RF reactive, eliminating all of the primary potential threats during an MRI procedure.

thumb|right|MR Conditional sign ''MR-Conditional'' — A device or implant that may contain magnetic, electrically conductive or RF-reactive components that is safe for operations in proximity to the MRI, provided the conditions for safe operation are defined and observed (such as 'tested safe to 1.5 teslas' or 'safe in magnetic fields below 500 gauss in strength').

thumb|right|MR Unsafe sign ''MR-Unsafe'' — Nearly self-explanatory, this category is reserved for objects that are significantly ferromagnetic and pose a clear and direct threat to persons and equipment within the magnet room.

The very high strength of the magnetic field can also cause "missile-effect" accidents, where ferromagnetic objects are attracted to the center of the magnet, and there have been incidences of injury and death. To reduce the risks of projectile accidents, ferromagnetic objects and devices are typically prohibited in proximity to the MRI scanner and patients undergoing MRI examinations are required to remove all metallic objects, often by changing into a gown or scrubs and ferromagnetic detection devices are used by some sites

There is no evidence for biological harm from even very powerful static magnetic fields

Radio frequency energy

A powerful radio transmitter is needed for excitation of proton spins. This can heat the body to the point of risk of hyperthermia in patients, particularly in obese patients or those with thermoregulation disorders. Several countries have issued restrictions on the maximum specific absorption rate that a scanner may produce.

Peripheral nerve stimulation (PNS)

The rapid switching on and off of the magnetic field gradients is capable of causing nerve stimulation. Volunteers report a twitching sensation when exposed to rapidly switched fields, particularly in their extremities. The reason the peripheral nerves are stimulated is that the changing field increases with distance from the center of the gradient coils (which more or less coincides with the center of the magnet). Note however that when imaging the head, the heart is far off-center and induction of even a tiny current into the heart must be avoided at all costs. Although PNS was not a problem for the slow, weak gradients used in the early days of MRI, the strong, rapidly switched gradients used in techniques such as EPI, fMRI, diffusion MRI, etc. are indeed capable of inducing PNS. American and European regulatory agencies insist that manufacturers stay below specified ''d''B/''dt'' limits (''d''B/''dt'' is the change in field per unit time) or else prove that no PNS is induced for any imaging sequence. As a result of ''d''B/''dt'' limitation, commercial MRI systems cannot use the full rated power of their gradient amplifiers.

Acoustic noise

Switching of field gradients causes a change in the Lorentz force experienced by the gradient coils, producing minute expansions and contractions of the coil itself. As the switching is typically in the audible frequency range, the resulting vibration produces loud noises (clicking or beeping). This is most marked with high-field machines and rapid-imaging techniques in which sound intensity can reach 120 dB(A) (equivalent to a jet engine at take-off), and therefore appropriate ear protection is essential for anyone inside the MRI scanner room during the examination.

Cryogens

As described in Physics of Magnetic Resonance Imaging, many MRI scanners rely on cryogenic liquids to enable superconducting capabilities of the electromagnetic coils within. Though the cryogenic liquids used are non-toxic, their physical properties present specific hazards.

An unintentional shut-down of a superconducting electromagnet, an event known as "quench", involves the rapid boiling of liquid helium from the device. If the rapidly expanding helium cannot be dissipated through an external vent, sometimes referred to as 'quench pipe', it may be released into the scanner room where it may cause displacement of the oxygen and present a risk of asphyxiation.

Oxygen deficiency monitors are usually used as a safety precaution. Liquid helium, the most commonly used cryogen in MRI, undergoes near explosive expansion as it changes from liquid to a gaseous state. The use of an oxygen monitor is important to ensure that oxygen levels safe for patient/physicians. Rooms built in support of superconducting MRI equipment should be equipped with pressure relief mechanisms and an exhaust fan, in addition to the required quench pipe.

Because a quench results in rapid loss of cryogens from the magnet, recommissioning the magnet is expensive and time-consuming. Spontaneous quenches are uncommon, but a quench may also be triggered by equipment malfunction, improper cryogen fill technique, contaminants inside the cryostat, or extreme magnetic or vibrational disturbances.

===Contrast agents=== The most commonly used intravenous contrast agents are based on chelates of gadolinium. In general, these agents have proved safer than the iodinated contrast agents used in X-ray radiography or CT. Anaphylactoid reactions are rare, occurring in approx. 0.03–0.1%. Of particular interest is the lower incidence of nephrotoxicity, compared with iodinated agents, when given at usual doses—this has made contrast-enhanced MRI scanning an option for patients with renal impairment, who would otherwise not be able to undergo contrast-enhanced CT.

Although gadolinium agents have proved useful for patients with renal impairment, in patients with severe renal failure requiring dialysis there is a risk of a rare but serious illness, nephrogenic systemic fibrosis, that may be linked to the use of certain gadolinium-containing agents. The most frequently linked is gadodiamide, but other agents have been linked too. Although a causal link has not been definitively established, current guidelines in the United States are that dialysis patients should only receive gadolinium agents where essential, and that dialysis should be performed as soon as possible after the scan to remove the agent from the body promptly. In Europe, where more gadolinium-containing agents are available, a classification of agents according to potential risks has been released. Recently a new contrast agent named gadoxetate, brand name Eovist (US) or Primovist (EU), was approved for diagnostic use: this has the theoretical benefit of a dual excretion path.

Pregnancy

No effects of MRI on the fetus have been demonstrated. In particular, MRI avoids the use of ionizing radiation, to which the fetus is particularly sensitive. However, as a precaution, current guidelines recommend that pregnant women undergo MRI only when essential. This is particularly the case during the first trimester of pregnancy, as organogenesis takes place during this period. The concerns in pregnancy are the same as for MRI in general, but the fetus may be more sensitive to the effects—particularly to heating and to noise. However, one additional concern is the use of contrast agents; gadolinium compounds are known to cross the placenta and enter the fetal bloodstream, and it is recommended that their use be avoided.

Despite these concerns, MRI is rapidly growing in importance as a way of diagnosing and monitoring congenital defects of the fetus because it can provide more diagnostic information than ultrasound and it lacks the ionizing radiation of CT. MRI without contrast agents is the imaging mode of choice for pre-surgical, in-utero diagnosis and evaluation of fetal tumors, primarily teratomas, facilitating open fetal surgery, other fetal interventions, and planning for procedures (such as the EXIT procedure) to safely deliver and treat babies whose defects would otherwise be fatal.

Claustrophobia and discomfort

Due to the construction of some MRI scanners, they can be potentially unpleasant to lie in. Older models of closed bore MRI systems feature a fairly long tube or tunnel. The part of the body being imaged must lie at the center of the magnet, which is at the absolute center of the tunnel. Because scan times on these older scanners may be long (occasionally up to 40 minutes for the entire procedure), people with even mild claustrophobia are sometimes unable to tolerate an MRI scan without management. Modern scanners may have larger bores (up to 70 cm) and scan times are shorter. This means that claustrophobia is less of an issue, and many patients now find MRI an innocuous and easily tolerated procedure.

Nervous patients may still find the following strategies helpful:

Advance preparation

*visiting the scanner to see the room and practice lying on the table

*visualization techniques

*chemical sedation

*general anesthesia

Coping while inside the scanner

*holding a "panic button"

*closing eyes as well as covering them (e.g. washcloth, eye mask)

*listening to music on headphones or watching a movie, using mirror-glasses and a projection screen or via a Head-mounted display, while in the machine.

Alternative scanner designs, such as open or upright systems, can also be helpful where these are available. Though open scanners have increased in popularity, they produce inferior scan quality because they operate at lower magnetic fields than closed scanners. However, commercial 1.5 tesla open systems have recently become available, providing much better image quality than previous lower field strength open models.

For babies and young children chemical sedation or general anesthesia are the norm, as these subjects cannot be instructed to hold still during the scanning session. Obese patients and pregnant women may find the MRI machine to be a tight fit. Pregnant women may also have difficulty lying on their backs for an hour or more without moving.

Guidance

Safety issues, including the potential for biostimulation device interference, movement of ferromagnetic bodies, and incidental localized heating, have been addressed in the American College of Radiology's ''White Paper on MR Safety,'' which was originally published in 2002 and expanded in 2004. The ''ACR White Paper on MR Safety'' has been rewritten and was released early in 2007 under the new title ''ACR Guidance Document for Safe MR Practices''. In December 2007, the Medicines in Healthcare product Regulation Agency (MHRA), a UK healthcare regulatory body, issued their ''Safety Guidelines for Magnetic Resonance Imaging Equipment in Clinical Use''. In February 2008, the Joint Commission, a US healthcare accrediting organization, issued a Sentinel Event Alert #38, their highest patient safety advisory, on MRI safety issues. In July 2008, the United States Veterans Administration, a federal governmental agency serving the healthcare needs of former military personnel, issued a substantial revision to their ''MRI Design Guide'', which includes physical or facility safety considerations.

The European Physical Agents Directive

The European Physical Agents (Electromagnetic Fields) Directive is legislation adopted in European legislature. Originally scheduled to be required by the end of 2008, each individual state within the European Union must include this directive in its own law by the end of 2012. Some member nations passed complying legislation and are now attempting to repeal their state laws in expectation that the final version of the EU Physical Agents Directive will be substantially revised prior to the revised adoption date.

The directive applies to occupational exposure to electromagnetic fields (not medical exposure) and was intended to limit workers’ acute exposure to strong electromagnetic fields, as may be found near electricity substations, radio or television transmitters or industrial equipment. However, the regulations impact significantly on MRI, with separate sections of the regulations limiting exposure to static magnetic fields, changing magnetic fields and radio frequency energy. Field strength limits are given, which may not be exceeded. An employer may commit a criminal offense by allowing a worker to exceed an exposure limit, if that is how the Directive is implemented in a particular member state.

The Directive is based on the international consensus of established effects of exposure to electromagnetic fields, and in particular the advice of the European Commissions's advisor, the International Commission on Non-Ionizing Radiation Protection (ICNIRP). The aims of the Directive, and the ICNIRP guidelines it is based on, are to prevent exposure to potentially harmful fields. The actual limits in the Directive are very similar to the limits advised by the Institute of Electrical and Electronics Engineers, with the exception of the frequencies produced by the gradient coils, where the IEEE limits are significantly higher.

Many Member States of the EU already have either specific EMF regulations or (as in the UK) a general requirement under workplace health and safety legislation to protect workers against electromagnetic fields. In almost all cases the existing regulations are aligned with the ICNIRP limits so that the Directive should, in theory, have little impact on any employer already meeting their legal responsibilities.

The introduction of the Directive has brought to light an existing potential issue with occupational exposures to MRI fields. There are at present very few data on the number or types of MRI practice that might lead to exposures in excess of the levels of the Directive. There is a justifiable concern amongst MRI practitioners that if the Directive were to be enforced more vigorously than existing legislation, the use of MRI might be restricted, or working practices of MRI personnel might have to change.

In the initial draft a limit of static field strength to 2 T was given. This has since been removed from the regulations, and whilst it is unlikely to be restored as it was without a strong justification, some restriction on static fields may be reintroduced after the matter has been considered more fully by ICNIRP. The effect of such a limit might be to restrict the installation, operation and maintenance of MRI scanners with magnets of 2 T and stronger. As the increase in field strength has been instrumental in developing higher resolution and higher performance scanners, this would be a significant step back. This is why it is unlikely to happen without strong justification.

Individual government agencies and the European Commission have now formed a working group to examine the implications on MRI and to try to address the issue of occupational exposures to electromagnetic fields from MRI.

Three-dimensional (3D) image reconstruction

The principle

Because contemporary MRI scanners offer isotropic, or near isotropic, resolution, display of images does not need to be restricted to the conventional axial images. Instead, it is possible for a software program to build a volume by 'stacking' the individual slices one on top of the other. The program may then display the volume in an alternative manner.

3D rendering techniques

;Surface rendering: A threshold value of greyscale density is chosen by the operator (e.g. a level that corresponds to fat). A threshold level is set, using edge detection image processing algorithms. From this, a 3-dimensional model can be constructed and displayed on screen. Multiple models can be constructed from various different thresholds, allowing different colors to represent each anatomical component such as bone, muscle, and cartilage. However, the interior structure of each element is not visible in this mode of operation.

;Volume rendering: Surface rendering is limited in that it only displays surfaces that meet a threshold density, and only displays the surface closest to the imaginary viewer. In volume rendering, transparency and colors are used to allow a better representation of the volume to be shown in a single image - e.g. the bones of the pelvis could be displayed as semi-transparent, so that even at an oblique angle, one part of the image does not conceal another.

Image segmentation

Where different structures have similar threshold density, it can become impossible to separate them simply by adjusting volume rendering parameters. The solution is called segmentation, a manual or automatic procedure that can remove the unwanted structures from the image.

See also

Earth's field NMR (EFNMR)

Electron-spin resonance (spin physics)

History of brain imaging

Medical imaging

Magnetic immunoassay

Jemris (open source MRI simulator)

''Magnetic Resonance Imaging (journal)''

Magnetic resonance microscopy

Magnetic particle imaging (MPI)

Magnetic resonance elastography

Molecular breast imaging

Neuroimaging software

Nephrogenic fibrosing dermopathy

Nobel Prize controversies

Nuclear magnetic resonance (NMR)

2D-FT NMRI and Spectroscopy

Relaxation

Robinson oscillator

Rabi cycle

Virtopsy

References

Further reading

External links

A Guided Tour of MRI: An introduction for laypeople National High Magnetic Field Laboratory

The Basics of MRI. ''Underlying physics and technical aspects''.

Video: What to Expect During Your MRI Exam from the Institute for Magnetic Resonance Safety, Education, and Research (IMRSER)

International Society for Magnetic Resonance in Medicine

Trends in Biotechnology Volume 28, Issue 7, July 2010, Pages 363-370

Blue Plaque commemorating the manufacture of the first commercial MRI whole body scanner at Osney Mead, Oxford

Royal Institution Lecture - MRI: A Window on the Human Body

Animal Imaging Database (AIDB)

Tutorial for performing an MRI Arthrogram

MRI & contrast media in Medicine

Category:Discovery and invention controversies Category:1973 introductions

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Coordinates	41°52′55″N87°37′40″N
name	The Hoosiers
background	group_or_band
origin	London, England
genre	Pop rock, Synthpop
years active	2003 - Present
label	Angelic Union
musical influences	The Cure, Jeff Buckley, The Flaming Lips, XTC
website	thehoosiers.com
current members	Irwin SparkesMartin SkarendahlAlphonso Sharland }}

The Hoosiers are an English pop/rock band, consisting of members Irwin Sparkes (lead vocals, lead guitar), Martin Skarendahl (bass guitar, rhythm guitar), and Alan Sharland (drums, percussion).

Their first single "Worried About Ray" reached #5 on the UK Singles Chart in July 2007. In October 2007, they released their debut album ''The Trick to Life'', which reached number 1 in the album charts. The band have recently released their second top ten album ''The Illusion of Safety'' which was released on 16 August 2010 and was preceded by the lead single "Choices" which was released on 1 August 2010.

Biography

Hailing from Exeter (Sharland), Reading (Sparkes, who attended Waingels College, formerly known as Waingels Copse School.) and Stockholm (Skarendahl), the band claimed to create a sound that they called "Odd pop", combining a number of musical genres with the first album ''The Trick to Life''. They reinvented themselves for the release of ''The Illusion of Safety'' as a more conventional pop band with electro influences.

According to the band's self-penned biographies (found on websites and in album sleeves), 'Alphonso' Raymond Sharland (drummer) and Irwin Nathaniel Sparkes (lead singer and guitarist) spent some time in the United States, encouraged by their chemistry teacher (Grant Serpell who was part of the band Sailor during their fame in the 1970s), in an attempt to broaden their horizons. The pair won themselves a football (soccer) scholarship at the University of Indianapolis {fact} despite a reputed claim to be "allergic to running", a claim which is backed up by lead singer Sparkes' asthma. Their time spent in Indiana inspired the band's name: a citizen of Indiana is colloquially called a Hoosier. Having gathered enough material to compile an album, Al and Irwin returned to London where they met Swiss keyboard player and sound engineer Duri Darms and Martin Skarendahl, a Swedish ex-fireman who was then working with Darms as a recording studio engineer and studying at The London Music School.

The original group included two band members (Tony Byrne and Tom Easey) who had by this point left, leaving Sparkes and Sharland to replace them with Skarendahl.

This newly-revamped trio of Sparkes, Skarendahl and Sharland subsequently signed to RCA and released their first album ''The Trick to Life'' on 22 October 2007. The band have spoken of their desire to write songs that are about more than just "boy and girl.. finding love on a Friday night on the lash with your mates",

In February 2008 they were named as Worst Band at the annual NME awards.

They are produced by ex-member of Jamiroquai, Toby Smith, and managed by Steve Morton.

The band's second single, "Goodbye Mr A", appeared in the football video game ''FIFA 08'', and the game can also be seen in the "Goodbye Mr A" music video. Lead singer Irwin Sparkes, who is from Reading, is playing on the game as Reading against Manchester United. The song also appears in a trailer for the 2007 film, 'Juno'. Following the release of "Worst Case Scenario", the next release from ''The Trick to Life'' was "Cops and Robbers", as confirmed in a live webchat with The Hoosiers on GMTV. The video was broadcast on Channel 4 at 12:10pm on 22 March 2008.

The title track "The Trick to Life" is featured as the end credits music on the thriller ''From Within'' released in 2009 which is ironically about a series of unexplained deaths in a small town.

For their second album, ''The Illusion of Safety'', several changes were made including a new, more synthesised sound and the drummer 'Alphonso' returning to his given name Alan. 'The Illusion of Safety' gave the first single 'Choices' and the album includes the song 'Unlikely Hero', for which a video was filmed in a quarry in Derbyshire. The latter was due to be a single until it was announced this was not the case in a Twitter message (or 'Tweet') on 14 October 2010. In February 2011, the band announced via their official website that 'Bumpy Ride' was to be their new single and would be released at the end of March. Their new deluxe album, also titled 'Bumpy Ride', was out in the April of the same year. The music video for 'Bumpy Ride' tells a story of how The Hoosiers travelled around the United States of America by various means of transport, and was possibly inspired by their earlier travels. It can be viewed here: http://www.youtube.com/watch?v=wQUeIBQ7-6M

Departure from Record Label

It was announced on 1 April 2011, that the band had departed from their record label Sony after a dispute over the promotion of their latest album 'The Illusion of Safety'. At an intimate gig for Real Radio in Sheffield, the band announced that they were repackaging and rereleasing the album with a new title, 'Bumpy Ride', on 11 April 2011. The rerelease comes with 4 new album tracks, and a deluxe version comes with a DVD of live performances.

Members

!Name	!Instrument
Irwin Sparkes	Vocals, guitar
Martin Skarendahl	Bass guitar, guitar
Alphonso "Alan" Sharland	Drums, vocals

Discography

2007: ''The Trick to Life''

2010: ''The Illusion of Safety''

2011: ''Bumpy Ride''

References

External links

The Hoosiers video interview with stv/music, October 2007

The Hoosiers Exclusive Interview

The Hoosiers Interview

Category:English pop music groups Category:Musical groups from London Category:Musical groups established in 2003

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Coordinates	41°52′55″N87°37′40″N
name	Kelly Clarkson
background	solo_singer
birth name	Kelly Brianne Clarkson
background	solo_singer
birth date	April 24, 1982
birth place	Fort Worth, Texas
origin	Burleson, Texas, United States
genre	Pop rock, pop
occupation	Singer-songwriter, record producer, actress
instrument	Vocals
years active	2002–present
label	RCA/19
associated acts	Reba McEntire
website	}}

Kelly Brianne Clarkson (born April 24, 1982) is an American singer, songwriter and actress. Clarkson came into prominence after becoming the winner of the inaugural season of the television series ''American Idol: The Search for a Superstar'' in 2002 and would later become the runner-up in the television special ''World Idol'' in 2003.

In 2003, Clarkson released her debut album, ''Thankful'', which was a commercial success and established herself in the pop music industry. The release of its first single, "A Moment Like This" (2002), broke The Beatles' record for the biggest leap to number one, from 52, in the history of the ''Billboard'' Hot 100 chart. After parting ways with her management, Clarkson developed a more rock-oriented music with the release of her critically acclaimed sophomore album, ''Breakaway'' (2004), which sold more than 12 million copies worldwide and which garnered Clarkson more worldwide success as a pop rock artist. The album's single, "Because of You" (2005), became the best-selling single by an ''Idol'' contestant worldwide. In 2007, Clarkson took full creative control for her third album ''My December'', which had had a more rock-inspired sound and was met with controversy and moderate success. Clarkson later returned to a more pop-oriented sound with ''All I Ever Wanted'' (2009), which became a commercial and critical success. The album's lead single, "My Life Would Suck Without You" (2009), currently holds the record for biggest leap to number one on the ''Billboard'' Hot 100 Chart, breaking her own record of "A Moment Like This" as well as earning her first number-one single in the United Kingdom. Clarkson's fifth studio album, ''Stronger'', was released on October 24, 2011, preceded by the international hit single, "Mr. Know It All".

In a career spanning a decade, Clarkson has become the most successful ''Idol'' contestant around the world, with over 24 million albums and 37 milion singles worldwide, according to ''Billboard'' and Nielsen SoundScan. Clarkson's work also gained her numerous accolades, including two Grammy Awards, three MTV Video Music Awards, twelve Billboard Music Awards, four American Music Awards and a Women's World Award. ''Billboard'' also ranked Clarkson the number fourteen artist of the 2000s, as well as being also ranked on the top 200 album sellers of the Nielsen SoundScan era at number 187.

Early life

Clarkson was born in Fort Worth, Texas, and grew up in the small town of Burleson, a suburb of Fort Worth. She is the third and youngest child of Jeanne Rose, a first grade English teacher of Greek descent and Stephen Michael Clarkson, a former engineer of English descent.

Clarkson's siblings include her older brother and sister, Jason and Alyssa. When Clarkson was six years old, her parents divorced after seventeen years of marriage. The family settled in Burleson, where Clarkson's mother married her second husband, Jimmy Taylor.

Clarkson's family struggled financially, and after her parents divorced, music became her refuge. Clarkson attended Pauline G Hughes Middle School and Burleson High School. She wanted to become a marine biologist but changed her mind after seeing the movie ''Jaws''. In seventh grade, a teacher (Mrs. Cynthia Glenn) overheard her singing in a hallway and asked her to audition for the school choir; Clarkson told the teacher that she had never received professional vocal training.

In high school, Clarkson performed in musicals such as ''Annie Get Your Gun'', ''Seven Brides for Seven Brothers'' and ''Brigadoon''. She sang at her high school talent show, after which an audience member shared some inspiring words with her: "God has given you this gift. You've got to sing. You're destined to sing." Clarkson continued singing and soon started classical training, hoping that music would be her ticket to a college scholarship.

Upon high school graduation, Clarkson was offered full scholarships to The University of Texas at Austin, University of North Texas, and Berklee, but decided against college because she had "already written so much music and wanted to try it on her own," and she figured "you're never too old to go to college." Clarkson later turned down two recording contracts from Jive Records and Interscope Records in the late 1990s, stating "They would have completely pigeonholed me as a bubblegum act. I was confident enough that something better would come along." She went to Los Angeles late 2001 to pursue a career in music, but worked as a waitress and appeared as an extra in such shows as ''Sabrina, the Teenage Witch'' and ''Dharma & Greg'' to support herself. She worked with songwriters such as Gerry Goffin and recorded five tracks between January and March 2002 to try to get a record deal, but returned to Texas after four months in Los Angeles.

Music career

2002–03: ''American Idol: The Search for a Superstar'' and ''World Idol''

Clarkson auditioned for the first season of ''American Idol'' (under the full title ''American Idol: The Search for a Superstar'') in May 2002. She subsequently won the competition on September 4, 2002, earning 58% of the vote to 42% for runner-up Justin Guarini. Choking back tears, Clarkson performed the ballad "A Moment Like This", the song written for the winner of ''American Idol'', which would subsequently appear on her debut album, ''Thankful''. When released as a single in October 2002, it set a record on the U.S. ''Billboard'' Hot 100 chart when it rose from number 52 to number one. This achievement was largely due to the impact from ''Idol'' as the CD single managed to sell 236,000 copies in its first week of sales in the U.S.; it spent five weeks at number one in Canada.

''American Idol'' season 1 performances and results

{|class="wikitable" |- !Week # !Theme !Song choice !Original artist !Order # !Result |- |Audition |Dallas |"Express Yourself" "At Last" |MadonnaEtta James |rowspan="4"|N/A |rowspan="5"|Advanced |- |Top 121 |Hollywood round 1 |"Respect" |Otis Redding |- |Top 65 |Hollywood round 2 |"I Say a Little Prayer" |Dionne Warwick |- |Top 45 |Hollywood round 3 |"Save The Best For Last" |Vanessa L. Williams |- |Top 30 |Semifinal/Group 2 |"Respect" |Otis Redding |9 |- |Top 10 |Motown |"You're All I Need to Get By" ||Marvin Gaye & Tammi Terrell |8 |rowspan="7"|Safe |- |Top 8 |1960s |"(You Make Me Feel Like) A Natural Woman" |Aretha Franklin |rowspan="2"|5 |- |Top 7 |1970s |"Don't Play That Song (You Lied)" |Ben E. King |- |Top 6 |Big Band |"Stuff Like That There" |Betty Hutton |6 |- |Top 5 |Burt Bacharach Love Songs |"Walk On By" |Dionne Warwick |1 |- |Top 4 |1980s1990s |"It's Raining Men""I Surrender" |The Weather GirlsCeline Dion |37 |- |Top 3 |Judges' ChoiceIdol's Choice |"Without You""Think Twice" |BadfingerCeline Dion |36 |- |Top 2 |Finale |"A Moment Like This""Respect""Before Your Love" |Kelly ClarksonOtis ReddingKelly Clarkson |246 |Winner |}

''World Idol'' performance and results

9

Song choice !! Germany !! Australia !! Pan-Arabia !! Canada !! Netherlands !! South Africa !! Poland !! USA !! Belgium !! UK !! Norway !! Total !! Result
"(You Make Me Feel Like) A Natural Woman"	9	|	5	9	9	8	8	12	9	9	10	97	Runner-up

In December 2003, a competition titled ''World Idol'' was held at the ''Pop Idol'' stage in London, gathering the winners of the first seasons of ''Idol series'' around the world. Clarkson was contractually obligated to participate, and placed second behind ''Norwegian Idol'' Kurt Nilsen. She performed Aretha Franklin's "(You Make Me Feel Like) A Natural Woman". She left immediately after the competition, later explaining to fans that she was not feeling well.

2003–04: ''Thankful''

Shortly after the completion of the first season of ''American Idol'', Clarkson was signed to RCA Records by Clive Davis and Simon Fuller. In 2003, Clarkson was later accused of working with a record company prior to winning ''American Idol''. ''American Idol'''s rules stated that a contestant was not allowed to compete on the program if they had been linked to a record company. However, she was cleared of all allegations, as she only had a contract in order to conduct demonstration work.

Following the release of "A Moment Like This", Clarkson's full-length debut album ''Thankful'' was released in North America by RCA Records on April 15, 2003 with several singers and songwriters including Christina Aguilera, Diane Warren and Babyface contributing on the tracks. It debuted at number one on the U.S. ''Billboard'' 200. To promote the album, Clarkson appeared on various episodes of ''American Idol'' in 2003. In October that year she performed in Australia at the 2003 NRL grand final. "A Moment Like This" was certified double platinum by the RIAA for sales of two million copies on December 8, 2003 and platinum by the CRIA for sales of 100,000 copies on February 10, 2004. ''Thankful'' peaked at number 41 on the UK albums chart and at number 33 on the Australian albums chart.

Reviews for the album were generally favorable. However, several critics noted that her early achievement was established due to her performances on ''American Idol''. ''Allmusic'' critic Stephen Thomas Erlewine praised the album for its vocal ability: "throughout this record, [Clarkson] makes it seem effortless and charming. She can croon, she can belt out a song, she can be sexy and sassy while still being graceful and as wholesome as the girl next door". Rachel Kipp of ''JS Online'' criticized Clarkson for not having the same personality on ''Thankful'' that she had on ''American Idol'', and wrote: "on ''American Idol'', Clarkson showcased a great voice and an endearing, 'aw-shucks' personality. That personality is missing on ''Thankful'', and there lies the album's greatest fault". Kipp blamed the producers behind the album for not allowing Clarkson to be herself. Clarkson covered Danielle Brisebois' "Just Missed the Train" on the album.

"Miss Independent" was released as the second single from ''Thankful''. It reached the top ten of the U.S. and Canadian singles charts, and earned Clarkson a 2004 Grammy Award nomination for "Best Female Pop Vocal Performance". When the single was released in the United Kingdom and Australia, it reached the top ten of the charts. "Low", the third single from ''Thankful'', reached number two in Canada, but it was unable to make the top 40 of the US chart. The final single, "The Trouble with Love Is", was released as a promotional single for the British romantic film ''Love Actually'' and failed to chart in the United States, she then promoted the song on ''Pop Idol'' in 2003.

2004–06: ''Breakaway''

Distancing herself from her ''American Idol'' image, Clarkson parted ways with 19 Entertainment and took more creative control with her second studio album ''Breakaway'', to develop a more rock-oriented image. Clarkson co-wrote six of the songs with songwriters such as former Evanescence band members Ben Moody, David Hodges and producer Max Martin; the title track was co-written by punk-pop singer Avril Lavigne.

''Breakaway'' was released by RCA Records on November 30, 2004. The album debuted within the U.S. top five and Canadian top ten, but sales were initially low in comparison to ''Thankful''. The singles from ''Breakaway'' were very successful, and the album become only the fourth album in history to stay in the ''Billboard'' 200 top 20 for a consecutive year, as well as being certified six times platinum in the U.S. in late 2007 and five times platinum in Canada in May 2006. With worldwide sales of over 12 million copies, ''Breakaway'' is the most successful album by an Idol.

''Breakaway'' received different responses from critics; ''Rolling Stone'' commented that "on Kelly Clarkson's second album, ... she embraces her rock side rather than the pop pageantry that put her on top of the ''American Idol'' heap". ''TeenInk'' noted the strength of her vocals on ''Breakaway'', and praised the change from pop music to contemporary rock: "[Clarkson] retains the incredible power and beauty of her voice while switching to rock". ''Stylus'' magazine also enjoyed Clarkson's foray into rock music, however, she was called out because of her ''American Idol'' image, which reviewer Charles Merwin believed she had yet to lose. He praised the non-singles and wrote that they "maintain a quality high". ''Allmusic'' called the album "a nice, low-key relief". "Breakaway" served as the original song for ''The Princess Diaries 2: Royal Engagement'' (2004) and achieved considerable success across the world; it became Clarkson's third top-ten single in the U.S. and fourth top-ten single in Canada. It reached number ten in Australia, and number 22 in the UK. The second single, "Since U Been Gone", which was produced by Max Martin, became the most successful release from the album. It reached number two in the U.S. and the top five across the world. It also earned Clarkson her first Grammy Award for "Best Female Pop Vocal Performance"; she won a second award for "Best Pop Vocal Album".

The third and fourth single releases, "Behind These Hazel Eyes" and "Because of You", also followed with chart success. The video for "Because of You" won the 2006 MTV Video Music Award for Best Female Video, her second consecutive win in that category (following "Since U Been Gone"). Clarkson was the most-played artist of 2006 on American radio, despite releasing only one single in the entire year, "Walk Away" (the fifth single from ''Breakaway''). She was also the most radio-broadcasted artist of 2006 in Australia and "Because of You" was the third most broadcast song of the same year, despite being released in 2005.

In 2005, Clarkson made a performance during the 2005 NBA All-Star Weekend as part of the festivities leading up to the All-Star Game. Later that year, she performed "The Star-Spangled Banner" at Game 2 of the NBA Finals between the San Antonio Spurs and Detroit Pistons She also performed that spring as part of the 2005 NCAA Final Four festivities in St. Louis, Missouri.

Clarkson performed during the festivities of the 2006 Winter Olympics in Torino, Italy. In mid 2006, Clarkson lent Ford Motor Co. a song titled "Go", written by Clarkson and Rhett Lawrence ("Miss Independent"). The song was used in the company's advertising campaign in 2006, "Bold Moves" and the song, along with its music video, was made available free at Ford's ''AddictedtoKelly.com'' website (now defunct).

2006–08: ''My December''

During her tour in Europe in 2006, Clarkson began writing songs for her third album, ''My December''. The first single from ''My December'' was "Never Again", which peaked on the ''Billboard'' Hot 100 at number eight. Clarkson released "Sober" as the second single. She returned to ''American Idol'' for the season 6 finale, performing "Never Again" and "Sgt. Pepper's Lonely Hearts Club Band" with Aerosmith guitarist Joe Perry during a Beatles medley.

Clarkson parted with her management, The Firm, in June 2007, amid low radio airplay for "Never Again" and low ticket sales for her then-upcoming tour. Clarkson would then sign with Starstruck Entertainment, run by Narvel Blackstock — the husband of Reba McEntire – on July 2, 2007. The same month, Live Nation announced that the tour—her first nationwide arena tour—had been canceled due to underwhelming ticket sales, to be rescheduled after the release of the ''My December'' album at smaller, more intimate concert environments. Clarkson reinstated plans to tour the U.S. during 2007, with a much smaller tour than the one she canceled in June. She began her My December Tour in October 2007 in venues significantly smaller than those previously booked. The August 2007 issue of ''Blender'' included a feature on Clarkson and her new album, as well as her music label woes.

''My December'' was released in the U.S. on June 26, 2007. The album debuted at number two in the U.S. with 291,000 albums sold, a slightly higher debut than Clarkson's previous album, ''Breakaway'', which debuted at number three. In Canada, the album was awarded a platinum certification for shipments of more than 100,000 copies. ''My December'' was certified platinum in December 2007 by the RIAA. It has sold more than three million copies worldwide.

In April 2007, Clarkson appeared on the ''American Idol'' ''Idol Gives Back'' charity show aimed at raising money for tackling poverty, hunger and AIDS in Africa, as well as the Hurricane Katrina appeal. Clarkson noted that she was in a dispute with her record label bosses and executives as to which song to perform for the event. Clarkson refused to perform her new single "Never Again" viewing it as simple self-promotion through a charitable event. She is quoted as saying,

She opted to perform Patty Griffin's "Up to the Mountain". After the performance, the audience who watched Clarkson perform live gave her a standing ovation. ''American Idol'' judge Simon Cowell described her as "incredible", saying, "When you let her [Clarkson] come back on the show it makes everybody else look like an amateur." Clarkson later sang "Never Again" in the ''American Idol'' grand finale on May 23, 2007. On July 7, 2007, Clarkson performed on the American leg of Live Earth. Clarkson was invited to be a celebrity mentor for ''Canadian Idol'' during its Top 5 week of the fifth season, aired on the CTV network on August 20, and she performed on the results show the next night. Clarkson also performed the grand finale of ''Swedish Idol'' in December 2007. Clarkson also performed at the 2007 NFL opening kickoff where she sang the national anthem and songs from ''My December''. Clarkson also performed in the halftime show for the Dallas Cowboys and New York Jets game on Thanksgiving Day.

In addition to her roles as spokeswoman for the acne treatment Proactiv as well as Vitaminwater, Clarkson partnered with NASCAR for the 2007 season. She appeared in televised advertising spots, performed at pre-race concerts, promoted NASCAR Day, and appeared at the Champions' Banquet in December. In April 2008, Clarkson participated in a Papal Youth Rally at the campus of St. Joseph's Seminary, Dunwoodie in Yonkers, New York performing a mini-concert for those in attendance. This was the Papal Visit of Pope Benedict XVI. She performed Schubert's "Ave Maria" for the Pope later in the day following the Pope's speech. Clarkson, raised a Baptist, was said to be honored by the invitation and appreciative of the rosary given to her and her band by the Pope, who were invited over by the Pope immediately following the performance for the rosary honor.

Clarkson performed "What Hurts the Most" with Rascal Flatts at the ACM Awards in 2006 and returned again to sing a duet with Reba McEntire in 2007. This was her second performance on a country music award show, even though she is in the pop/rock genre. Along with her performance with Rascal Flatts, Clarkson also performed "Cigarettes", with the country duo The Wreckers during one of their shows in Texas.

Building on her country music status, Clarkson and Reba McEntire, who first met after Clarkson won the first season of ''American Idol'', recorded an hour-long ''CMT Crossroads'' special at Nashville's famed Ryman Auditorium on February 22, 2007. It aired on CMT and Palladia (then known as MHD) on June 24, 2007. Previously, Clarkson was a performer on CMT's ''Giants: Reba McEntire''. where she sang McEntire's hit song "Why Haven't I Heard From You", introduced Dolly Parton, and later also sang McEntire's hit "Does He Love You" with Martina McBride. Clarkson also appeared on an episode of McEntire's sitcom ''Reba'', that aired on January 14, 2007.

At the Academy of Country Music Awards on May 16, 2007, Clarkson and McEntire sang a duet of Clarkson's own 2005 single, "Because of You", which also became the lead single from McEntire's album of all-star duets. The music video for this version of the song later debuted on June 20, 2007. This collaboration with McEntire earned Clarkson a CMA Award nomination for "Musical Event of the Year" in 2007 and a Grammy Award nomination for "Best Country Collaboration With Vocal" in 2008. Additionally, the song was featured on ''Now That's What I Call Country'', which was released in August 2008.

Clarkson was a surprise guest at the 2007 CMA Music Festival in Nashville on June 7, 2007, where she performed "Does He Love You" and "Because of You" with Reba McEntire during the internationally-renowned annual event. The performance of "Because of You" was taped and aired as part of the "CMA Music Festival: Country's Night To Rock" television special that aired on ABC on July 23, 2007.

On January 17, 2008, Clarkson embarked on the 2 Worlds, 2 Voices Tour 2008, a co-headlining tour with Reba McEntire. Reba and Clarkson have since stayed in touch and Clarkson is now managed by McEntire's husband Narvel Blackstock.

On May 18, 2008, Clarkson performed on stage at the Academy of Country Music Awards All-Star Jam with Reba McEntire and Ronnie Dunn of Brooks and Dunn. The All-Star jam is the final event of the week taking place immediately after the awards show. Clarkson was not announced ahead of time for an appearance.

2008–10: ''All I Ever Wanted''

Clarkson's fourth album, ''All I Ever Wanted'', was released on March 10, 2009. During recording of the album, Clarkson worked closely with producer-songwriters Ryan Tedder, Dr. Luke, Max Martin, and Howard Benson, among others. In its first week of sales, it sold 255,000 copies in the U.S., debuting at number one on the ''Billboard'' 200; it stayed at number one for two weeks. ''All I Ever Wanted'' received a Grammy Award nomination for "Best Pop Vocal Album". Clarkson was placed eighth on ''Billboard'' Magazine's Top Female Artists of 2009 and ninth on ''Billboard'' Magazine's Top Hot Artists of 2000s. She was ranked second on ''Billboard'' Magazine's Best of 2000s: Pop Song Artist, behind Pink.

The first single from ''All I Ever Wanted'', "My Life Would Suck Without You", entered the ''Billboard'' Hot 100 at number 97 and rose to number one the following week; this broke the record for the largest leap to the top spot, formerly held by Britney Spears' "Womanizer".This was the second time Clarkson broke this record. Moreover, "My Life Would Suck Without You" was Clarkson's first number one in the United Kingdom and it made her the first ''American Idol'' winner to achieve a number one single in the UK. The album's second single, "I Do Not Hook Up", peaked at number 20 in the U.S. "I Do Not Hook Up" did not fare very well overseas and the believed reason for this is due to a lack of radio support because a previous version had been recorded by Katy Perry. The third single, "Already Gone", reached number 13 in the USA but failed to achieve international success, attaining only number 66 in the UK.

"Already Gone" sparked another conflict between Clarkson and her label. There was a widely reported scandal with the album's third single, which Clarkson wrote with OneRepublic's Ryan Tedder. Many critics had noticed that the backing track and style of the song sounded similar to Beyoncé's "Halo". After becoming aware of the comparisons, Clarkson did not want to release the song out of respect for Beyoncé, instead requesting release for a self-penned song, "Cry", which later hailed extremely positive reviews, most notably from the BBC. However, her record company refused, publishing "Already Gone" against Clarkson's wishes. In response to the entire fiasco, Clarkson penned a song called "Wash Rinse Repeat" in which she states her view on the lack of creativity record labels give their artists; it is widely believed the song is an attack on Ryan Tedder.

The fourth single was "All I Ever Wanted". Clarkson performed as one of many guests for the return of ''VH1 Divas'' in September 2009. Clarkson also became a guest mentor on the Dutch television series ''X Factor'' in November 2009.

Clarkson was announced as one of the VH1 Save the Music Foundation ambassadors for 2009–2010. She began her 32-date ''All I Ever Wanted'' tour in October, following a string of summer concerts around the United States. Clarkson toured all over the world with the album, reaching territories such as Europe, South Africa, Oceania and Asia.The fall tour shows were performed in arena/theater type venues, with the summer tour being performed in outdoor amphitheatres. Her Indonesia show was initially sponsored by tobacco company Djarum, but after complaints from some fans and anti-tobacco groups, the promoter removed the sponsor. The tour ended in May 2010 in China.

2010–present: ''Don't You Wanna Stay'' and ''Stronger''

On August 23, 2010, it was announced that Clarkson had recorded a duet called "Don't You Wanna Stay" with country star Jason Aldean for Aldean's upcoming album, ''My Kinda Party''. They performed the song at the 2010 CMA Awards on November 10, 2010 and again on April 14, 2011 during the elimination show of ''American Idol'' season ten. On the week ending February 27, 2011, the song moved to number one on ''Billboard'' Hot Country Songs, making Clarkson her first number one hit on the chart. As of July 21, 2011, "Don't You Wanna Stay" has sold nearly 1.9 million digital singles, becoming the most downloaded country music collaboration of all time. "Don't You Wanna Stay" is nominated for a 2012 Grammy Award for "Best Country Duo/Group Performance".

Clarkson's fifth studio album, ''Stronger'', was released on October 24, 2011. Clarkson began writing the material on November 2009 and was originally intended for a late 2010 release. Clarkson collaborated with several producers including Greg Kurstin, Ester Dean, Darkchild, Toby Gad, Steve Jordan and Howard Benson. Clarkson completed recording on February 28, 2011, and stated that it "was influenced by Prince, Tina Turner, Sheryl Crow, Radiohead and there's a little bit of a country vibe/influence on a couple of songs." On March 15, 2011, she announced that the album had been pushed back to September 2011. Rodney Jerkins told ''The Hollywood Reporter'' that it was a "smart decision", while Claude Kelly, said to MTV News that the move could work in her favor. ''Associated Content'' also reported that the delay was caused by the company restructuring at Sony Music with the former Universal Music Group chairman Doug Morris entering as its new CEO. The release of the album was accompanied by a limited release of Clarkson's first extended play, ''The Smoakstack Sessions'', which featured alternate versions of ''Stronger'' and ''All I Ever Wanted'' songs.

The first single, "Mr. Know It All", premiered via a live webcast on on August 30, 2011 and was commercially released on September 5, 2011. The song entered the ''Billboard'' Hot 100 at number 18, becoming her second highest debut since "Never Again" (2007); On November 3, the song ascended to number 10, earning Clarkson her ninth top ten single. On October 2, 2011, Clarkson performed the song at the 2011 NRL Grand Final in Sydney, Australia, marking Clarkson's first appearance at the event since the 2003 NRL Grand Final. The following week, "Mr. Know It All" hit #1 on the Australian charts, the first single of her career to top the charts in that country. 'Mr Know It All charted at number 4 in the UK and 8 in New Zealand. The song recieved 2x Platinum in Australia and Gold in New Zealand. The album's second single, "Stronger (What Doesn't Kill You)", was released in December 2011 and impacted radio on January 17, 2012. The song has charted at number 2 in the United States, 4 in both New Zealand and Poland and 8 in the UK.

The song "Tell Me A Lie" on the debut album by the boy band One Direction was co-written by Clarkson, which was originally intended for ''Stronger''. The song was leaked onto the internet a few months before. Clarkson's second extended play, ''iTunes Session'', was announced on November 23, 2011, and was released on December 27, 2011. On December 2 Clarkson released her first Christmas single, a cover of "I'll Be Home For Christmas" which is included on ''iTunes Session'' EP.

Clarkson is also confirmed to mentor country singer Blake Shelton's contestants on the second season of ''The Voice'' in its live shows in 2012. With this feat, Clarkson becomes the only reality singing competition contestant to appear on ''Idol'', ''The X Factor'' and ''The Voice''. Also, at Super Bowl 46 Clarkson sang the American National Anthem.

Politics

On December 29, 2011, Clarkson posted on Twitter her endorsement of US Congressman Ron Paul as a 2012 presidential candidate, saying, "I love Ron Paul. I liked him a lot during the last Republican nomination and no one gave him a chance. If he wins the nomination for the Republican Party in 2012 he's got my vote. Too bad he probably won't."

Film career

Soon after the first season of ''American Idol'' ended, Clarkson starred with ''Idol'' runner-up Justin Guarini in the movie ''From Justin to Kelly'' (2003). The film was poorly received by critics and grossed only $5 million at the North American box office, less than half its reported budget. Clarkson has mentioned in interviews that she is shocked when people send her scripts after ''From Justin to Kelly'', often citing contractual obligation as her sole reason for involvement in the film. Clarkson was quoted telling ''People'', "I knew when I read the script it was going to be real, real bad, but when I won, I signed that piece of paper and I could not get out of it." The script was written by Kim Fuller, Simon Fuller's brother.

She played Brenda Lee in the television drama ''American Dreams'' and appeared in the sitcom ''Reba''. She also participated in sketch comedy on ''MADtv'' (2002) and ''Saturday Night Live'' (2005).

Filmography (acting roles only)

Source: IMDb {|class="wikitable" border="1" |- ! scope="col" | Year ! scope="col" | Title ! scope="col" | Role ! scope="col" | Episode |- |rowspan=5|2002 ||''Sabrina the Teenage Witch'' ||rowspan=3| as an extra (uncredited) || "The Whole Ball of Wax" |- |''Dharma & Greg'' || |- |''That '80s Show'' || "Valentine's Day" (S1, Ep2) |- |''Issues 101'' ||Crystal (as an extra) || Theatrical film |- |''MADtv'' ||Herself / Skits || Season 8, Ep 1 |- |rowspan=2|2003 ||''From Justin to Kelly'' ||Kelly Taylor|| Theatrical film |- |rowspan=2| ''American Dreams'' ||rowspan=2| Brenda Lee || "And Promises To Keep" |- |rowspan=2|2004 || "Tidings of Comfort and Joy" |- |''King of the Hill'' || Herself/Dawn|| "Stressed For Success" |- | rowspan=2|2005 || ''Saturday Night Live'' ||Herself / Skits / Musical Guest|| Host – Jason Bateman |- |''Damage Control'' ||Herself||Season 1, Ep. 1 |- |2007 ||''Reba'' ||Kelly|| "As We Forgive Those" |- |2009 || ''Saturday Night Live'' ||Herself / Musical Guest|| Host – Tracy Morgan |- |2011|| ''Phineas and Ferb'' ||Herself || "A Phineas and Ferb Family Christmas" |- |2012 || ''Saturday Night Live'' ||Herself / Musical Guest|| Host – Charles Barkley confirmed on air |}

Vocal ability

Clarkson possesses the vocal range of a soprano; her vocal talents and abilities have been met with praise from critics and celebrities alike. On an interview with ''Good Morning America'', Simon Cowell was asked of the then six ''American Idol'' winners, who he thought had the best voice. Cowell immediately answered that Clarkson did "by a mile", noting that she was "up there" with other great singers such as Celine Dion.

Arion Berger of ''Rolling Stone'' has said of Clarkson that "her high notes are sweet and pillowy, her growl is bone-shaking and sexy, and her midrange is amazingly confident for a pop posy whose career is tied for eternity to the whims of her ''American Idol'' overlords."

Dr. Luke, a songwriter and producer of some of Clarkson's hits stated that "She has powerful lungs. She's like the Lance Armstrong of vocal cords."

''Esquire'' wrote that Clarkson has “the best voice in the history of pop music".

Discography

''Thankful'' (2003)

''Breakaway'' (2004)

''My December'' (2007)

''All I Ever Wanted'' (2009)

''Stronger'' (2011)

Tours

;Headlining

Breakaway World Tour (2005–2006)

My December Tour (2007–2008)

All I Ever Wanted Tour (2009–2010)

Stronger Tour (2012)

;Promotional

Kelly Clarkson in Concert (2003)

Kelly Clarkson: Live in Concert (2009)

;Co-headlining

American Idols LIVE! Tour 2002 (with the American Idol Season 1 Finalists) (2002)

Independent Tour (with Clay Aiken) (2004)

2 Worlds 2 Voices Tour (with Reba McEntire) (2008)

Awards

See also

List of artists who reached number one in the United States

List of artists who reached number one on the UK Singles Chart

List of artists who reached number one on the U.S. Adult Contemporary chart

List of artists who reached number one on the U.S. dance airplay chart

List of artists who reached number one on the U.S. Adult Top 40 chart

List of artists who reached number one on the U.S. country chart

List of artists who reached number one on the Australian singles chart

List of best-charting music artists in the U.S.

List of Idol series winners

References

Further reading

Phares, Heather. [ "Kelly—Biography"]. ''Allmusic''. Retrieved February 11, 2006.

Lamb, Bill. "Kelly Clarkson—Profile". About.com. Retrieved February 11, 2006.

Phares, Heather. "Kelly Clarkson—Biography". Yahoo LAUNCHcast. Retrieved February 11, 2006.

International charting information. ''Top40-Charts.com''. Retrieved February 12, 2006.

''Kelly Gets Cocky''. ''Idol'' winner fires Simon Fuller. PopSugar.com. ''Blog Archives''. Retrieved February 25, 2006.

. ''E! Online''. [''Some films defy criticism''.] Retrieved May 4, 2006.

Croatto, Pete. ''From Justin to Kelly''. [''Watching From Justin to Kelly, one question looms over the entire production: Why was this movie made?''] Retrieved May 4, 2006.

External links

Category:1982 births Category:Actors from Texas Category:American Christians Category:American female singers Category:American film actors Category:American Idol winners Category:American people of Greek descent Category:American people of Irish descent Category:American people of Welsh descent Category:American pop singer-songwriters Category:American record producers Category:English-language singers Category:American sopranos Category:Grammy Award winners Category:Living people Category:Musicians from Texas Category:People from Fort Worth, Texas Category:RCA Records artists

ar:كيلي كلاركسون az:Kelli Klarkson bg:Кели Кларксън ca:Kelly Clarkson cs:Kelly Clarkson co:Kelly Clarkson da:Kelly Clarkson de:Kelly Clarkson et:Kelly Clarkson el:Κέλι Κλάρκσον es:Kelly Clarkson fa:کلی کلارکسون fr:Kelly Clarkson ko:켈리 클락슨 hy:Կելլի Քլարկսոն hr:Kelly Clarkson id:Kelly Clarkson is:Kelly Clarkson it:Kelly Clarkson he:קלי קלרקסון jv:Kelly Clarkson ka:კელი კლარკსონი csb:Kelly Clarkson la:Kelly Clarkson lv:Kellija Klarksone lt:Kelly Clarkson hu:Kelly Clarkson ms:Kelly Brianne Clarkson nl:Kelly Clarkson ja:ケリー・クラークソン no:Kelly Clarkson nn:Kelly Clarkson uz:Kelly Clarkson pl:Kelly Clarkson pt:Kelly Clarkson ro:Kelly Clarkson ru:Кларксон, Келли simple:Kelly Clarkson sk:Kelly Clarksonová sl:Kelly Clarkson sr:Keli Klarkson fi:Kelly Clarkson sv:Kelly Clarkson tl:Kelly Clarkson th:เคลลี คลาร์กสัน tr:Kelly Clarkson uk:Келлі Кларксон vi:Kelly Clarkson yi:קעלי קלערקסאן bat-smg:Kelly Clarkson zh:凱莉·克萊森

Coordinates	41°52′55″N87°37′40″N
Birth name	Laurence Tureaud
Birth date	May 21, 1952
Birth place	Chicago, Illinois, U.S.
Occupation	Actor, motivational speaker, wrestler, bodyguard, television personality
Years active	1982–present
Website	}}

Mr. T (born Laurence Tureaud; May 21, 1952) is an American actor known for his roles as B. A. Baracus in the 1980s television series ''The A-Team'', as boxer Clubber Lang in the 1982 film ''Rocky III'', and for his appearances as a professional wrestler. Mr. T is known for his trademark African Mandinka warrior hairstyle, his gold jewelry, and his tough-guy image. In 2006 he starred in the reality show ''I Pity the Fool'', shown on TV Land, the title of which comes from the catchphrase of his character, Clubber Lang, in the 1982 film ''Rocky III''.

Early life

Mr. T was born in Chicago, Illinois, the youngest son in a family with twelve children. His father, Nathaniel Tureaud Sr., was a minister. Tureaud, with his four sisters and seven brothers, grew up in a three-room apartment in one of the city's housing projects, the Robert Taylor Homes, in a poorly constructed building, in an area with high levels of environmental pollutants and the largest concentration of poverty in America. His mother received a welfare check of $87/month. While growing up Tureaud regularly witnessed murder, rape, and other crimes, but attributes his survival and later success to his will to do well and his mother's love.

Tureaud attended Dunbar Vocational High School, where he played football, wrestled, and studied martial arts. While at Dunbar he became the city-wide wrestling champion two years in a row. He won a football scholarship to Prairie View A&M; University, where he majored in mathematics, but was expelled after his first year. He then enlisted in the United States Army and served in the Military Police Corps. In November 1975 Tureaud was awarded a letter of recommendation by his drill sergeant and in a cycle of six thousand troops Tureaud was elected "Top Trainee of the Cycle" and was also promoted to Squad Leader. In July 1976 Tureaud's platoon sergeant punished him by giving him the detail of chopping down trees during training camp at Fort McCoy in Wisconsin, but the sergeant did not tell how many trees to stop at, and so Tureaud had single-handedly chopped down over seventy trees from 6:30am to 10:00am until a higher ranking major in shock relieved him, superseding the sergeant's orders. After his discharge, he tried out for the Green Bay Packers of the National Football League, but failed to make the team due to a knee injury.

Tureaud next worked as a bouncer. It was at this time that he created the persona of Mr. T. His wearing of gold neck chains and other jewelry was the result of customers losing the items or leaving them behind at the night club after a fight. A customer, who may have been banned from the club or trying to avoid another confrontation, would not have to re-enter the club if Mr. T wore their jewelry as he stood out front. When a customer returned to claim the item, it was readily visible and available with no further confrontations required. Along with controlling the violence as a doorman, Tureaud was mainly hired to keep out drug dealers and users. During his bouncing days Tureaud was in over 200 fights and was sued a number of times but won each case. "I have been in and out of the courts as a result of my beating up somebody. I have been sued by customers whom I threw out that claimed that I viciously attacked them without just cause and/or I caused them great bodily harm as a result of a beating I supposedly gave them," Mr. T once remarked.

He eventually parlayed his job as a bouncer into a career as a bodyguard that lasted almost ten years. During these years he protected, among others, sixteen prostitutes, nine welfare recipients, five preachers, eight bankers, ten school teachers, and four store owners. As his reputation improved, however, he was contracted to guard, among others, David Fricker, seven clothes designers, five models, seven judges, three politicians, six athletes and forty-two millionaires. He protected well-known personalities like Muhammad Ali, Steve McQueen, Michael Jackson, Leon Spinks, Joe Frazier and Diana Ross, charging $3,000/day, with the highest charge of $10,000 per day depending on the clientele's risk-rate and traveling locations.

With his reputation as "Mr. T", Tureaud attracted strange offers and was frequently approached with odd commissions, which included: assassination, tracking runaway teenagers, locating missing persons, and large firms asking him to collect past-due payments by force. Tureaud was once anonymously offered $75,000 to assassinate a target and received in the mail a file of the hit and an advance of $5,000, but he refused it. "He offered me $75,000 to kill his friend. The last envelope and letter contained a round-trip airline ticket, first class, United. Plus there was $5,000 wrapped in a little package, fifty and hundred dollar bills. I tell you the honest truth, when I saw that money I didn't believe it was real." -Mr. T. Tureaud states that he tried to warn the victim but it was too late and the man died in a car accident. In accepting a client for Tureaud there were two rules: 1) A client cannot lie to him. 2) All potential clients are required to shop around the field of security before coming to him. He also made it clear to the client beforehand that he could not promise them their lives, "I did everything except guarantee people's lives, but I guarantee you that I will give my life protecting yours". He carried a .357 magnum and a .38 caliber snubnose pistol. He weighed an average of 255 pounds.

While he was in his late twenties, Tureaud won two tough-man competitions consecutively. The first aired as "Sunday Games" on NBC-TV under the contest of "America's Toughest Bouncer" which included throwing a 150 lb stuntman, and breaking through a four-inch wooden door. For the first event, Tureaud came in third place. For the end, two finalists squared off in a boxing ring for a two-minute round to declare the champion. Making it to the ring as a finalist, his opponent was a 280 pound Honolulu bouncer, Tutefano Tufi. Within twenty seconds "Mr. T" gave the six foot five competitor a bloody nose, and later a bloody mouth. He won the match and thus the competition. The second competition was aired under the new name "Games People Play" on NBC-TV. When interviewed by Bryant Gumbel before the final boxing match, Mr T. said, "I just feel sorry for the guy who I have to box. I just feel real sorry for him." For this second competition the final event of the fight was scheduled to last three rounds, but Mr. T finished the fight in less than 54 seconds. When Sylvester Stallone spotted Mr. T in this second airing, it is strongly believed that the interview with Bryant Gumbel was worked into the scene of the Rocky movie that originated his famous line "I don't hate him but...I pity the fool."

Acting roles and work

While reading ''National Geographic'', Mr. T first noticed the unusual hairstyle for which he is now famous, on a Mandinka warrior. He decided that adoption of the style would be a powerful statement about his African origin. It was a simpler, safer and more permanent visual signature than his gold chains, rings, and bracelets. The gold jewelry was worth about $300,000 at the time and took him about an hour to put on. Most nights, Mr. T spent even more time cleaning them using an ultrasonic cleaner. Occasionally, he slept with the heavy neck chains and bracelets on, "to see how my ancestors, who were slaves, felt."

In 1980, Mr. T was spotted by Sylvester Stallone while taking part in NBC's "America's Toughest Bouncer" competition, a segment of NBC's ''Games People Play''. Although his role in ''Rocky III'' was originally intended as just a few lines, Mr. T was eventually cast as Clubber Lang, the primary antagonist. His catchphrase "I pity the fool!" comes from the film; when asked if he hates Rocky, Lang replies, "No, I don't hate Balboa, but I pity the fool." Subsequently, after losing out on the role of the title character's mentor in ''The Beastmaster'', Mr. T appeared in another boxing film, ''Penitentiary 2'', and on an episode of Showtime's early sketch comedy series ''Bizarre'', where he fights and eats Super Dave Osborne, before accepting a television series role on ''The A-Team''.

Mr. T also appeared in an episode of ''Silver Spoons'', reprising his old role as bodyguard to Ricky Stratton. In the episode, he explains his name as "First name: ''Mister''; middle name: ''period''; last name ''T''." In one scene, when Ricky's class erupts into a paper-ball-throwing melee, Mr. T throws his body in front of the objects, fully protecting his client.

In ''The A-Team'', he played Sergeant Bosco "B.A." Baracus, an ex-Army commando on the run with three other members from the United States government "for a crime they didn't commit." As well as the team's tough guy, B.A. was a genius mechanic but afraid of flying. When asked at a press conference whether he was as stupid as B.A. Baracus, Mr. T observed quietly, "It takes a smart guy to play dumb."

His role in ''The A-Team'' led to him making an appearance in the long-running sit-com ''Diff'rent Strokes'' in the sixth season opener "Mr T. and mr. t" (1983), in which an episode of ''The A-Team'' is supposedly filmed in the family's penthouse apartment.

A Ruby-Spears-produced cartoon called ''Mister T'' premiered in 1983 on NBC. The ''Mister T'' cartoon starred Mr. T as himself, the owner of a gym where a group of gymnasts trained. He helped them with their training but they also helped him solve mysteries and fight crime in ''Scooby-Doo''-style scenarios. Thirty episodes were produced.

In 1984, he made a motivational video called ''Be Somebody... or Be Somebody's Fool!''. He gives helpful advice to children throughout the video; for example, he teaches them how to understand and appreciate their origins, how to dress fashionably without buying designer labels, how to make tripping up look like breakdancing, how to control their anger, and how to deal with peer pressure. The video is roughly one hour long, but contains 30 minutes of singing, either by the group of children accompanying him, or by Mr. T himself. He sings "Treat Your Mother Right (Treat Her Right)," in which he enumerates the reasons why it is important to treat your mother right, and also raps a song about growing up in the ghetto and praising God. The raps in this video were written by Ice T.

In 1988, Mr. T starred in the television series ''T. and T''. Mr. T was once reported to be earning around $80,000 a week for his role in ''The A-Team'' and earning $15,000 for personal appearances. By the end of the 1990s, he was appearing only in the occasional commercial, largely because of health problems (in 1995, he was diagnosed with T-cell lymphoma). He frequently appears on the TBN Christian television network. He has appeared on ''Late Night with Conan O'Brien''. He has also appeared on some Comcast commercials, and in the United Kingdom, Ireland, Australia and New Zealand during 2007, advertising the chocolate bar Snickers with the slogan "Get Some Nuts!" One of these commercials, featuring Mr. T crashing through a wall on the back of a technical vehicle before firing Snickers bars at a speed walker wearing tight-fitting yellow shorts, was pulled by Mars following a complaint by the U.S.-based group Human Rights Campaign, despite the fact that the advert had never been shown outside the U.K. The group alleged that the commercial promoted the idea that violence against gay, lesbian, bisexual and transgender people "is not only acceptable, but humorous." Mr. T has distanced himself from these accusations, insisting that he would never lend his name to something that supports such beliefs, and that the commercials did not depict such promotions. The commercials are still shown on Australian and UK television.

Mr. T did a video campaign for Hitachi's Data Systems that was created and posted on consumer video sites including YouTube and Yahoo! Video. According to Steven Zivanic, senior director and corporate communications of HDS, "this campaign has not only helped the firm in its own area, but it has given the data storage firm a broader audience." In November 2007, Mr. T appeared in a television commercial for the online role playing game ''World of Warcraft'' with the phrase ''"I'm Mr. T and I'm a Night Elf Mohawk"''. A follow-up to this commercial appeared in November 2009 where he appeared promoting the "mohawk grenade" item, which appears in game and turns other players into Mr. T's likeness.

In 2008, Mr. T appeared on the American channel ''Shopping TV'' selling his "Mr. T Flavorwave Oven." A video game starring Mr T. is also being developed by ZootFly. Mr. T was offered a cameo appearance in the film adaptation of ''The A-Team'', but decided to turn it down, whereas Dwight Schultz and Dirk Benedict were both to make cameos in the film, before 20th Century Fox cut out the scenes. (George Peppard died in 1994).

In the 2009 movie ''Cloudy with a Chance of Meatballs (film)'', Mr. T provided the voice for Officer Earl Devereaux, the town's athletic cop who loves his son very much.

, Mr. T is presenting a clip show on BBC Three named ''World's Craziest Fools''. The show features stories such as botched bank robberies and inept insurance fraudsters.

Wrestling

Mr. T entered the world of professional wrestling in 1983. He was Hulk Hogan's tag-team partner at the World Wrestling Federation's (WWF) first ''WrestleMania'' which he won. Hulk Hogan wrote in his autobiography that Mr. T saved the main event of WrestleMania I between them and "Rowdy" Roddy Piper and "Mr. Wonderful" Paul Orndorff because when he arrived, security would not let his entourage into the building. Mr. T was ready to skip the show until Hogan personally talked him out of leaving. Piper has said that he and other fellow wrestlers disliked Mr. T because he was an actor and had never paid his dues as a professional wrestler.

Remaining with the WWF, Mr. T became a special "WWF boxer" in light of his character in ''Rocky III''. He took on "Cowboy" Bob Orton on the March 1, 1986 edition of ''Saturday Night's Main Event,'' on NBC. This boxing stunt ultimately culminated in another boxing match against Roddy Piper at ''WrestleMania 2''. Mr. T returned to the World Wrestling Federation as a special guest referee in 1987 as well as a special referee enforcer confronting such stars as the Honky Tonk Man.

Seven years later, Mr. T reappeared as a special referee for a Hogan-Ric Flair match, in October 1994, at WCW's ''Halloween Havoc'', and then went on to wrestle again, defeating Kevin Sullivan at that year's ''Starrcade''. Another seven years later Mr. T appeared in the front row of the November 19, 2001, episode of ''WWF Raw''.

Albums

In 1984, Mr. T released an album titled ''Mr. T's Commandments'' (Columbia/CBS Records), much in the same tone as his 1984 educational video, which instructed children to stay in school and to stay away from drugs. He followed it up with a second album the same year, titled ''Mr. T's Be Somebody... or Be Somebody's Fool!'' (MCA Records), which featured music from the film of the same name. In 2002, Mr. T appeared in the video for "Pass The Courvoisier" by Busta Rhymes featuring P. Diddy and Pharell Williams.

Personal life

Mr. T is a born-again Christian.

He gave up virtually all his gold, one of his identifying marks, after helping with the cleanup of Hurricane Katrina in 2005. He said, "As a Christian, when I saw other people lose their lives and lose their land and property... I felt that it would be a sin before God for me to continue wearing my gold. I felt it would be insensitive and disrespectful to the people who lost everything, so I stopped wearing my gold."

Filmography

+ Film and Television
! Year	! Title	! Role	Notes
1982	''Penitentiary II''	Himself
1982	''Rocky III''
1982	''Twilight Theatre''		TV Series
1983	''D.C. Cab''	Samson
1983		Himself	TV Series
1983	''Diff'rent Strokes''	Himself	TV Series
1983		Himself	Episode: "The C Team"
1983–1987	''''		TV Series
1984	''The Toughest Man in the World''	Bruise Brubaker	TV
1984	''Be Somebody... or Be Somebody's Fool!''	Himself	Video
1984–1986, 1988	''WWF Superstars of Wrestling''	Himself	TV Series
1985		Himself	Video
1986	''WrestleMania 2''	Himself	Video
1987		Jabberwock	TV movie
1988–1990	''T. and T.''	T. S. Turner	TV Series
1993	''Freaked''	The Bearded Lady
1993		Mr. T-Rex
1994		Himself	TV Series
1994	''Magic of the Golden Bear: Goldy III''	Freedom
1995	''Kids Against Crime''	Himself
1996	''Spy Hard''	Helicopter Pilot
1998	''Saturday Night Live: The Best of Eddie Murphy''	Mister Robinson's neighbour	Video
1999		Himself
1999	''Malcolm and Eddie''	Calvin	Episode: "The Wrongest Yard"
2001	''Not Another Teen Movie''	The Wise Janitor
2001		J. T. Quincy	Cloud Ten Pictures
2004	''Johnny Bravo''	Himself	"T is for Trouble"
2004	''''	Himself	Episode: "Today I Am a Clown"
2005	''Return of the Lads''	Lad No 3 with Mark Egan and Cian Duffy
2006		Himself
2009	''''	Himself
2009		Earl Devereaux
2011	''World's Craziest Fools''	Himself	BBC Three

References

External links

Mohawk Media Mr. T site

TV Land's official I Pity The Fool page

Legendary TV's Mr. T profile

Mr. T discusses his Christian faith

Mr T. talks technology

Mr. T on a late 70s Local Chicago TV Show -- discussing being Leon Spinks bodyguard

Category:1952 births Category:Actors from Chicago, Illinois Category:African American film actors Category:American Christians Category:African American television actors Category:American television personalities Category:Bodyguards Category:Living people Category:Prairie View A&M; Panthers football players Category:United States Army soldiers

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