MRI or magnetic resonance imaging is a type of diagnostic testing your doctor may order to help diagnose certain bone and soft tissue conditions. By use of radio waves and a large magnet, a scan of the affected area is performed giving a three dimensional image of the deep structures within the body. Your doctor and certified radiologist interpret the results to provide a better understanding of the current problem. There is no radiation exposure during an MRI. People who should avoid MRI studies are those with pacemakers, inner ear implants, surgical clips in the head, and certain artificial heart valves. Other implants or metal joint replacement parts should not pose any problems with the scanning procedure.