Magnetic resonance imaging is a medical imaging technique used in radiology to form pictures of the anatomy and the physiological processes of the body in both health and disease. MRI scanners use strong magnetic fields electric field gradients , and radio waves to generate images of the organs in the body. MRI does not involve X-rays and the use of ionizing radiation , which distinguishes it from CT or CAT. Magnetic resonance imaging is a medical application nuclear magnetic resonance(NMR). NMR can also be used for imaging in other NMR applications such as NMR spectroscopy
While the hazards of X-rays are now well-controlled in most medical contexts, MRI may still be seen as a better choice than CT. MRI is widely used in hospitals and clinics for medical diagnosis , staging of disease and follow-up without exposing the body to . However, MRI may often yield different diagnostic information compared with CT.