special subjects
Magnetic Resonance Imaging (MRI)
Uses of MRI
MRI is preferred to Computed Tomography (CT) (CT) when doctors need more detail about soft tissues—for example, to image abnormalities in the brain, spinal cord, muscles, and liver. MRI is particularly useful for identifying tumors in these tissues. MRI is also used to do the following: Measure certain molecules in the brain that distinguish a brain tumor from a brain abscess Identify abnormalities in female reproductive organs and fractures in the hip and pelvis Help doctors evaluate joint abnormalities (such as tears in ligaments or cartilage in the knee) and sprains Help doctors evaluate bleeding and infection MRI is also used when the risks of CT are high. For example, MRI may be preferred for people who have had a reaction to the Radiographic Contrast Agents used in CT and for pregnant women (because radiation can cause problems in the fetus). MRI done after a gadolinium contrast agent is injected into a vein helps doctors evaluate inflammation, tumors, and blood vessels. Injecting this agent into a joint helps doctors get a clearer picture of joint abnormalities, particularly if they are complex (as in injuries or degeneration of ligaments and cartilages in the knee). 