Answer:
The abbreviation is MRI and it means: a special radiological test that uses magnetic waves to create pictures of an area, including bones, muscles, and tendons. MRI is often used in medical clinics.
MRI is a form of Nuclear magnetic resonance (NMR) which uses a magnet to interact with hydrogen nuclei for instance. As the body is made up of 70% water, and water is 2 parts hydrogen, there is a lot of hydrogen in your body. Damage to tissues can therefore be seen rapidly.