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An MRI scan, or magnetic resonance imaging scan, is a test that provides very clear pictures of structures inside the body. Doctors may want an MRI to help diagnose various diseases such as brain tumours or torn ligaments.

If your doctor wants an MRI, the decision whether or not to have the scan is yours. In this pamphlet the benefits and risks of this procedure will be reviewed.

Test

A magnetic resonance imaging scan, known as MRI scan or just MRI, does NOT use x-rays. Before the test you will be asked to change into a gown and remove your watch, beepers, credit cards, and other magnetic sensitive devices which will be effected by the MRI machine. These items can be stored in the locked change room.

You can eat and drink and take medications as usual on the day of your scan, unless you have specific instructions otherwise.

You will be placed inside a magnet. The magnet is like a big long square donut with a hole in the middle and open at both ends. While you are in the magnet you will hear loud noises.

The combination of the magnetic field and different radio frequencies allow a specialized computer to generate excellent pictures of inside the body.

The test takes anywhere from 20 minutes to one and one half hours, depending on the type of scan you are having. It is very important to lie very still during the test to get clear pictures. MRI Technologists are sitting at the control booth in the next room and they can see you through the glass. They will talk to you throughout the test. If you have any questions be sure to ask them. They will be more than glad to help you.

In case you are claustrophobic or afraid of small spaces, you should speak to your doctor about getting medication to help you tolerate the small space. Make sure to tell the technologist if you have this problem before the test.

Some patients need a dye given through the vein to help see structures better inside the body. This dye is considered to be safe.

If you are having an abdominal scan, please do not eat or drink 4 hours prior. You can take medication as usual.

After your scan you may return to your normal activities. You will get the result from your doctor, usually in about two weeks. The results could be ready earlier in emergency cases.

Risks and Complications

MRI scans are very safe. Because MRI technology and the dyes used are fairly new, the very long term effects are not known. There are NO reasons to suspect any harmful long term effects, but again, the long-term effects are not known.

Pregnant women should be scanned only after consultation with the MRI Radiologist and ordering Physician and when the benefits clearly outweigh any potential risk to the unborn child.

Allergic reactions to the dye used are possible but not at all likely.

Because of the high field strength magnet, patients with cardiac pacemakers are not allowed in the magnet room.

It is your responsibility to tell your doctor and the MRI Technologist about any implants or metallic fragments in your body. If you have ever had a metallic foreign body in your eye, you need to have it x-rayed to ensure it is no longer present before proceeding with the MRI. This is VERY important to avoid any potential deadly complications.

MRI is very safe for selected patients. Risks and complications are very rare.

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