Mri of the heart

MRI (magnetic resonance imaging) is a test that uses a magnetic field and pulses of radio wave energy to make pictures of the organs and structures inside the body. An MRI of the heart looks at the structures and blood vessels of the heart.

When you have an MRI, you lie on a table and the table moves into the MRI machine. A special dye (contrast material) may be put in a vein (I.V.) in your arm or hand to make the blood vessels easier to see on the scan.

An MRI of the heart is done to look at the structures and blood vessels of the heart. These may include:

• The heart muscle and the sac around the heart (pericardium).
• The heart valves.
• The coronary arteries. These are the blood vessels that bring blood to your heart muscle.
• The blood vessels that carry blood from the lungs to the heart.
• The aorta. This is a large blood vessel that carries blood from the heart to the rest of the body.

Before the test

• You may have contrast material (dye) put into your arm or hand through a tube called an I.V.
• You will remove all metal objects. These include hearing aids, dentures, jewelry, watches, and hairpins.
• You will take off all or most of your clothes and then change into a gown. If you do leave some clothes on, make sure you take everything out of your pockets.
• If you wear a medicine patch, you may need to remove it. The MRI can cause burns with some patches.

During the test

• You will lie on a table that is part of the MRI scanner.
• Small pads or patches (electrodes) will be placed on your skin on each arm and leg and on your chest. The electrodes are hooked to a machine that traces your heart activity onto a paper.
• The table will slide into the space that contains the magnet.
• Inside the scanner you will hear a fan and feel air moving. You may hear tapping, thumping, or snapping noises. You may be given earplugs or headphones to reduce the noise.
• You will be asked to hold still during the scan. You may be asked to hold your breath for short periods.
• You may be alone in the scanning room. But a technologist will watch through a window and talk with you during the test.

In general, there's nothing you have to do before this test, unless your doctor tells you to.

Tell your doctor if you get nervous in tight spaces. You may get a medicine to help you relax. If you think you'll get this medicine, be sure you have someone to take you home.