An MRI uses magnetic waves to make pictures of the inside of the
body. It can make two-dimensional and three-dimensional
pictures. Reasons for Test You may have an MRI to diagnose a
condition or look for internal injuries. MRIs can look at any
body part, from your head to your toes. MRIs can also be used to
see if medication or treatment is working. MRIs can be harmful
if you have metal inside your body, such as joint replacements
or a pacemaker. Make sure your doctor knows of any internal
metal before the test. A contrast dye may be used to enhance
some images. Some people may have a bad reaction to this dye.
Talk to your doctor about any allergies you have or if you have
liver or kidney problems. Liver and kidney problems may make it
difficult for your body to get rid of the contrast. What to
Expect Prior to Test Follow your doctors instructions regarding
eating and drinking before the test. This will depend on what
part of the body is being examined. At the MRI center: Your
doctor may give you a medicine t