Nuclear magnetic resonance - abdomen; NMR - abdomen; Magnetic resonance imaging - abdomen; MRI of the abdomen; Liver MRI - abdomen; Pancreas MRI - abdomen; Kidney MRI - abdomen DefinitionAn abdominal magnetic resonance imaging scan is an imaging test that uses powerful magnets and radio waves. The waves create pictures of the inside of the belly area. It does not use radiation (x-rays). Single magnetic resonance imaging (MRI) images are called slices. The images can be stored on a computer, viewed on a monitor, printed on film or scanned to a disk. One exam produces dozens or sometimes hundreds of images. How the Test is PerformedYou may be asked to wear a hospital gown or clothing without metal zippers or snaps (such as sweatpants and a t-shirt). Certain types of metal can cause blurry images. You will lie on a narrow table. The table slides into a large tunnel-shaped scanner. Some exams require a special dye (contrast). Most of the time, the dye is given during the test through a vein (IV) in your hand or forearm. The dye helps the radiologist see certain areas more clearly. During the MRI, the person who operates the machine will watch you from another room. The test lasts about 30 to 60 minutes, but it may take longer. How to Prepare for the TestYou may be asked not to eat or drink anything for 4 to 6 hours before the scan. Tell your health care provider if you are afraid of close spaces (have claustrophobia). You may be given a medicine to help you feel sleepy and less anxious. Your provider may also suggest an open MRI, in which the machine is not as close to your body. Before the test, tell your provider if you have:
Because the MRI contains strong magnets, metal objects are not allowed into the room with the MRI scanner. Avoid carrying items such as:
How the Test will FeelAn MRI exam causes no pain. You may get medicine to relax you if you have a problem lying still or are very nervous. Moving too much can blur MRI images and cause errors. The table may be hard or cold, but you can ask for a blanket or pillow. The machine makes loud thumping and humming noises when turned on. You can wear ear plugs to help reduce the noise. An intercom in the room allows you to speak to someone at any time. Some MRI facilities have televisions and special headphones to help you pass time. There is no recovery time, unless you were given a medicine to help you relax. After an MRI scan, you can go back to your normal diet, activity, and medicines. Why the Test is PerformedAn abdominal MRI provides detailed pictures of the belly area from many views. It is often used to clarify findings from earlier ultrasound or CT scan exams. This test may be used to look at:
MRI can distinguish tumors from normal tissues. This can help your provider know more about the tumor such as size, severity, and spread. This is called staging. In some cases it can give better information about masses in the abdomen than CT. What Abnormal Results MeanAn abnormal result may be due to:
RisksMRI does not use ionizing radiation. No side effects from the magnetic fields and radio waves have been reported. The most common type of contrast (dye) used is gadolinium. It is very safe. Allergic reactions are rare but can occur. If you have a history of severe allergic reactions to other medicines you should notify your doctor. In addition, gadolinium can be harmful to people with kidney problems who need dialysis. Tell your provider before the test if you have kidney problems. The strong magnetic fields created during an MRI can cause heart pacemakers and other implants not to work as well. The magnets can also cause a piece of metal inside your body to move or shift. ReferencesAl Sarraf AA, McLaughlin PD, Maher MM. Current status of imaging of the gastrointestinal tract. In: Adam A, Dixon AK, Gillard JH, Schaefer-Prokop CM, eds. Grainger & Allison's Diagnostic Radiology: A Textbook of Medical Imaging. 7th ed. Philadelphia, PA: Elsevier; 2021:chap 18. Levine MS, Gore RM. Diagnostic imaging procedures in gastroenterology. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 124. Mileto A, Boll DT. Liver: normal anatomy, imaging techniques, and diffuse diseases. In: Haaga JR, Boll DT, eds. CT and MRI of the Whole Body. 6th ed. Philadelphia, PA: Elsevier; 2017:chap 43. | ||
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Review Date: 7/5/2022 Reviewed By: Jason Levy, MD, FSIR, Northside Radiology Associates, Atlanta, GA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team. View References The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. No warranty of any kind, either expressed or implied, is made as to the accuracy, reliability, timeliness, or correctness of any translations made by a third-party service of the information provided herein into any other language. © 1997- A.D.A.M., a business unit of Ebix, Inc. Any duplication or distribution of the information contained herein is strictly prohibited. | ||
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Digestive system
MRI scans
