Magnetic resonance imaging is a testing technique that uses magnetic and radio-frequency waves to look at your heart throughout its blood pumping cycle. Clear, three-dimensional images help determine the structure and function of the heart, lungs, major blood vessels and area around the heart and detect blood vessel plaques and blockages as well as damage from heart attack or heart disease. The test is non-invasive, but requires you to lie on a table that moves through a magnet-shaped chamber. Electrodes are placed on your body for monitoring purposes and often an intravenous (IV) line is inserted into your arm to inject a dye to enhance the images.

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