Definition: MRI stands for magnetic resonance imaging, which is a type of scan that uses radio waves, a powerful magnet, and computers to show what is going on inside your body. The signal types that are produced by normal and abnormal areas are different and help the radiologist tell the difference between normal and abnormal anatomy. This type of scan produces images that are similar to a CT scan but the technology does not use radiation or x-rays. In some places of the body it can be more accurate and precise. Usually it is used for brain, spine and joint imaging. However it is sometimes helpful in the pelvis when looking for details in anatomy that a CT scan or ultrasound may not provide.
Examples:The CT scan was not clear so an MRI was ordered to see if muscle and nerves in the pelvis was involved by ovarian cancer.