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MRI stands for Magnetic Resonance Imaging. MRIs are scans that show the structure of the body, especially the brain. They are useful for checking for problems in all parts of the body, including injuries. MRIs are usually used when other tests have not found a problem or if there is suspicion that something other than a tissue injury may be causing pain or loss of function. MRIs use electromagnetic waves to take pictures of areas inside the body. The MRI machine contains strong magnets which cause iron-containing substances in your body, such as bone marrow and muscle fibers, to become visible on an image created by a computer. For this reason, people with metal objects inside their body (such as surgical staples or pacemakers) may not be able to get an MRI. This usually does not include jewelry. The MRI machine is placed into a large, donut-shaped magnet that creates the magnetic field needed to produce images of soft tissues in your body. An electromagnet is used to keep the body part being examined still inside the magnet during the procedure. Once placed inside, you are asked to lie completely still while pictures are taken for about 20 minutes. It takes several hours for the signal from within your body to accumulate in the computer, so it is very important that you do not move during this time. Some people with metal objects in their body (like pacemakers) may not be able to get an MRI. This usually does not include jewelry. MRIs are painless and generally safe, but they do present risks. Some patients may experience pain or numbness in the area of examination when the contrast material is injected into the body by an IV line. Most MRI scans use magnetic fields and radio waves to help create detailed images of organs, soft tissues, bone, and virtually all other internal structures of the body. Most MRIs are done on an outpatient basis; once you are in the scanner, you can read or listen to music through earphones while pictures are taken for about 20 minutes. MRIs take several hours to complete because your body must first accumulate a signal to be recorded. This can be affected by blood flow moving through the body, so it is very important that you do not move during this time. Some people with metal objects in their body (like pacemakers) may not be able to get an MRI. This usually does not include jewelry. Many parts of your body are safe for imaging, including the skin, muscles, bones, ligaments, tendons, nerves and other organs. For example, MRIs are often used to image the brain and spinal cord for injuries or conditions such as multiple sclerosis, tumors or strokes. For this reason, people with metal objects inside their body (such as surgical staples or pacemakers) may not be able to get an MRI. This usually does not include jewelry.This article is a wiki article. If you have a question about MRIs that is not answered here please feel free to join the discussion at the linked WikiProject Medical Imaging page.References http://www.nlm.nih.gov/medlineplus/magneticresonanceimaging(MRIs). cfa1e77820
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