MRI Scans

MRI stands for Magnetic Resonance Imaging. The test is completely painless and harmless to the patient. The resonance is invaluable in the detection of cancer, and very reliable in the diagnosis of diseases of the spinal cord and brain, as well as joint disorders. MRI scanners are good at looking at the "soft tissue" of the body. In particular, the brain, nerves and spinal cord are seen much more clearly with MRI than with regular x-rays and CAT scans. Also, muscles, ligaments and tendons are seen quite well, so MRI scans are commonly used to look at knees and shoulders following injuries. As well as being used to locate tumours, MRI can also be used to measure blood flow. An MRI scanner uses no x-rays or other radiation.

For the scan, patients are placed on a sliding table in the centre of the scanner. If, due to illness, you are unable to lie down, a sedative may be administered. Sedatives can also be used for young children. To increase comfort inside the MRI, we have installed additional lighting and ventilation. In some cases, a special agent (contrast) may be injected to improve picture quality. The use of contrast allows for clearer evaluation of the structure being imaged, and also the function of tissues and organs. The contrast can occasionally cause allergic reactions or side effects such as nausea or vomiting. Contrast agents for MRI tests do not interact with other drugs and are entirely eliminated from the body shortly after being administered. The test does not affect driving. Contrast agents are not needed for full body MRI scans

It is advised that patients come to a test on an empty stomach (fasting for at least 4-6 hours). You should not consume solid foods, drink coffee, cola or other beverages containing caffeine. You cannot bring any metal objects (such as keys, key chains, etc.) into the MRI room, as they may be attracted by the magnet and can damage equipment or cause injury. Also, you should not enter the MRI room with a watch or magnetic cards (ATM cards, credit cards, etc.) as these may be demagnetized. Any makeup should be avoided as some cosmetics may contain metal particles which could reduce the quality of the image.

Certain patients may not be able to have an MRI. These include people who get nervous in small spaces and those with metallic heart valves, implanted orthopedic plates, or other metal objects placed inside the body such as:

• vascular clips, vena cava filters, artificial valves

• intrauterine contraceptives and inserts

• dental prostheses and metal braces

• internal hearing aids

• ocular prostheses

• clamps that stimulate bone growth

• insulin pumps, or other drug giving devices

• other metal elements in the body

Tests should not be performed on those patients with implanted pacemakers or surgical metal clips in the brain. It is also advised to exercise caution in women in the first trimester of pregnancy. It is also advised that women in their first trimester of pregnancy exercise caution

MRI testing usually takes from 30 minutes to an hour.

Example of MRI questionnaire