WHAT IS MAGNETIC RESONANCE IMAGING (MRI)?
Magnetic resonance imaging (MRI) is a special test that produces very clear, detailed pictures of the organs and structures within your body. The test uses a powerful magnetic field, radio waves, and a computer to create images in cross section. While a conventional x-ray shows bone well, an MRI lets your physician see structures made of soft tissue such as ligaments and cartilage, and organs such as your brain and heart.
WHEN IS IT USED?
Injuries show up well on an MRI. For example, an MRI may show whether you have torn ligaments or torn cartilage in your knee, and help your physician decide whether or not you need surgery. It is also useful for injuries involving the shoulder, back, or neck. MRI's are also used to see problems in the brain and spinal cord, and to see the size and location of tumors.
HOW DO I PREPARE FOR THE PROCEDURE?
No special preparation is needed. You may eat normally and take any medications. For the test, wear loose, comfortable clothing without metal fasteners such as zippers or clasps, because metal will interfere with the test. Do not wear jewelry. If you have any metal in your body (such as plates or screws from a previous surgery) tell you physician. If you have a pacemaker, you cannot have an MRI because the test may damage it. If you have any metal fragments in your eyes, you cannot have an MRI because the test may injure your eyes.
WHAT HAPPENS DURING THE PROCEDURE?
You will lie down on a cushioned bed that moves into a doughnut-shaped magnet that is open at both ends. If you get nervous when you are in small, closed places, talk to your doctor before the procedure is scheduled. He or she may be able to give you medication that will help you feel less nervous. You will have to be very still during the procedure so that the pictures will not be blurry.
Most MRI's take between 30 and 60 minutes. You will hear loud knocking and a whirring sound while the pictures are being taken. You will wear earplugs, or music will be provided so that the noise does not sound so loud. When the test is over you may go home. Your physician will schedule an appointment with you to discuss the results.
WHAT ARE THE BENEFITS AND RISKS?
An MRI is painless. There is no radiation, and there are no harmful side effects.
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