Magnetic Resonance Imaging
Magnetic resonance imaging, also called MRI, is a noninvasive and typically painless medical test. It uses a powerful magnetic field, radio waves and a computer to produce detailed pictures of organs, soft tissues, bone and virtually all other internal body structures. The images can then be examined on a computer monitor or printed.

MRI does not use ionizing radiation (x-rays), and the MR images allow physicians to better evaluate parts of the body and certain diseases that may not be assessed adequately with x-ray, ultrasound or computed tomography (also called CT or CAT scanning).