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. The good contrast it provides between the different soft tissues of the body make it especially useful in brain, muscles, heart, and cancer compared with other medical imaging techniques such as computed tomography (CT) or X-rays.
MRI is regarded as superior to computed axial tomography (CAT scan) for most central nervous system abnormalities, particularly those of the posterior fossa, brainstem, and spinal cord. It has become an important tool in imaging of muscles and bones. This procedure is not recommended for someone suffering from claustrophobia. Contraindications to MRI are pacemakers, metallic aneurysm clips, and some metallic prostheses or other foreign objects.