Magnetic Resonance Imaging Services

What is Magnetic Resonance Imaging (MRI)?

MRI is one of the most significant advances in medical imaging this century. It allows physicians to see inside the human body with remarkable detail. MRI does not use X-rays to create images. Instead, it combines magnetic fields with radio waves and uses specially designed computers to produce detailed images of internal body structures.

Although X-rays may be best for showing bones, physicians use MRI to examine "soft" tissue such as muscle, nerves, cartilage, ligaments, tendons, vertebral discs and various internal organs.

What happens during an MRI examination?

Although MRI is an advanced medical technique, the examination itself is relatively easy and comfortable for most people. You will be asked to lie on a cushioned table. A device called an imaging coil will be placed over or under you. When you are comfortably positioned, the table will move into the magnet. From the control area, the technologist will stay in constant contact with you, both visually and through an intercom.

As the examination begins, you will hear a variety of muffled thumping or clicking sounds. These sounds are normal during the examination and should not be cause for concern. Other than the muted sounds you will hear, MRI produces no bodily sensations. Examinations take anywhere from 45 to 60 minutes depending on your particular procedure.

How should I prepare for an MRI examination?

The day of your examination, it is best to wear loose, comfortable clothing such as a sweatshirt and sweatpants. If possible, avoid clothing with metallic objects such as zippers, snaps and grommets as metal may interfere with the imaging process. If you must wear clothing with metal, hospital gowns will be provided. Makeup and hairsprays also should be avoided.

Before your test, you will be asked to remove all metallic objects, such as eyeglasses, jewelry, wristwatches, etc. There are no restrictions of foods before your MRI examination. You should, however, avoid coffee and other caffeinated beverages because you will be required to lie still for several minutes at a time. You may take your normal medications, unless your physician has instructed you to do otherwise.

Depending on the type of examination you will have, you may receive an injection of contrast material (similar to X-ray dye). If you are allergic to any medications, or have had a previous allergic reaction X-ray dye, please tell your physician, the radiologist or the technologist.

What should I do during the examination?

To ensure the best possible examination, it is important that you lie still during the procedure and pay careful attention to the instructions given by the technologist. Although MRI is considered safe for most people, there are some reasons not to have the examination. Before proceeding with your examination – for your safety – please tell your physician or the technologist if you have:

•	Aneurysm clips
•	A cardiac pacemaker
•	An artificial heart valve
•	A metal plate, pin or other metallic implant
•	An intrauterine device, such as a Copper-7 IUD
•	A previous gunshot wound
•	Ever been a metal worker
•	A permanent (tattoo) eyeliner

In addition, any woman who is pregnant, or thinks she may be pregnant, should let her physician know before proceeding with the examination.

What happens after the examination?

Your examination will be carefully reviewed by a radiologist, a physician specially trained to interpret the MRI images. The radiologist will provide your physician with a detailed report. Your physician then will discuss these results with you and explain what they mean in relation to your health.

For more information

For more information about the MRI examination, please talk to your physician or you may call Great River Medical Center’s MRI Department at (319) 768-4867.