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What are the limitations of MRI of the Body?

Magnetic resonance imaging (MRI) of the body uses a powerful magnetic field, radio waves and a computer to produce detailed pictures of the inside of your body. Doctors may use it to help diagnose or monitor treatment for a variety of conditions within the chest, abdomen, and pelvis. If you are pregnant, the doctor may use body MRI to safely monitor your baby.

Tell your doctor about any health problems, recent surgeries, or allergies and whether there’s a possibility you are pregnant. The magnetic field is not harmful, but it may cause some medical devices to malfunction. Most orthopedic implants pose no risk, but you should always tell the technologist if you have any devices or metal in your body. Guidelines about eating and drinking before your exam vary between facilities. Unless your doctor says otherwise, take your regular medications as usual. You should remove all jewelry, avoid wearing makeup, and wear loose, comfortable clothing. Most MRI facilities will ask that you change to a hospital gown. Some clothing may contain metallic fibers which cannot be worn inside the MRI. If you have claustrophobia or anxiety, you may want to ask your doctor for a mild sedative prior to the exam. If you take any relaxation medication, you should make sure you have a ride home.

High-quality images depend on your ability to remain still and follow breath-holding instructions while the technologist records the images. If you are anxious, confused or in severe pain, you may find it difficult to lie still during the MRI and the image quality will suffer. A large person may not fit into certain types of MRI machines. There are weight limits on the scanners. Implants and other metallic objects can make it difficult to obtain clear images. Patient movement can have the same effect. A large amount of ascites fluid in the abdomen/pelvis can also create artifact that results in low-quality MR images. If you cannot hold your breath, some MRI exams may be of limited quality as the pictures will be blurry. An MRI exam typically costs more and may take more time than other imaging exams. Talk to your insurance provider if you have concerns about the cost of MRI.