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What Is MRI, and How Does It Work?
Magnetic resonance imaging (MRI) technology is unrivaled in its ability to produce high resolution images of soft tissue and structural anatomy. Conditions that may only be apparent from physical signs and symptoms may be clearly seen, providing better information to determine appropriate treatment. During a MRI examination the part of your body to be studied, will be positioned in the center of a magnetic field and scanned. In some cases, the radiologist will recommend an intravenous (IV) contrast injection to further enhance the results of the study.
MRI, which uses magnetic fields, radio waves and complex computer processing to produce sectional images of the body, has revolutionized the field of musculoskeletal and neurologic imaging. Images of the brain, spine and joints, not attainable with any other imaging modality are produced with no exposure to radiation. MRI can also depict the liver, gallbladder, pancreatic ducts and bile ducts (MRCP MR cholangiopancreatography). MRI can be used to examine arteries of the brain, neck, chest, abdomen and extremities.
What to Expect During an MRI Exam
MRI examinations are painless. ALL MRI exams involve strong magnetic fields. For your safety, each MRI appointment requires completion of a screening form to identify any condition you may have that could prevent a MRI examination
Some MRI examinations require an intravenous (IV) contrast injection (during the exam) to enhance the results of your study. This injection, performed by a nurse or technologist, is placed in a vein in your hand or arm. Contrast reactions / allergies* to the contrast agent, Gadolinium, are rare.
Motion can distort images, so you will be asked to lie still for periods of 5 to 15 minutes. Total examination times vary from 30 minutes to 1 hour or more depending, on the information needed.
While the machine is in operation, it is normal to hear intermittent humming and thumping sounds. An intercom system in the room will enable you to communicate with the technologist at anytime during your scan. All rooms are air-conditioned, and listening to music is optional.
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