Magnetic Resonance Imaging (MRI) of the Head

MRI (Magnetic Resonance Imaging), Head

Risks

There are no known harmful effects from the strong magnetic field used for MRI. But the magnet is very powerful. The magnet may affect pacemakers, implantable cardioverter-defibrillators (ICDs,) artificial limbs, and other medical devices that contain iron. The magnet will stop a watch that is close to the magnet.

Metal pieces in the eyes can damage the retina. If you might have metal pieces in your eye, an X-ray of the eyes may be done before the MRI. If metal is found, the MRI will not be done.

Iron pigments in tattoos or tattooed eyeliner can cause skin or eye irritation.

An MRI can cause a burn with some medication patches. Be sure to tell your health professional if you are wearing a patch.

There is a small chance of developing an allergic reaction if contrast material is used during the MRI. However, most reactions are mild and can be treated with medicine. There also is a small chance of an infection at the IV site.

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Author:	Jan Nissl, RN, BS	Last Updated: January 19, 2007
Medical Review:	Kenneth B. Sutherland, CD, BSc, MD, FRCPC - Diagnostic Radiology Paul D. Traughber, MD - Radiology
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