Magnetic Resonance Imaging

Overview

What is Magnetic Resonance Imaging (MRI)?

An MRI is a diagnostic procedure that uses a combination of a large magnet, radiofrequencies, and a computer to produce detailed images of organs and structures within the body. MRI of the heart can be used to accomplish the following:

• assess blood flow to the heart muscle
• detect tumors
• evaluate infections
• evaluate the heart's structure

The MRI machine is a large, cylindrical (tube-shaped) machine that creates a strong magnetic field around the patient. This magnetic field, along with a radiofrequency, alters hydrogen atoms' natural alignment in the body. Computers are then used to form 2-dimensional images of the heart's structure based on the activity of the hydrogen atoms. Cross-section views can be obtained to reveal further details. MRI does not use radiation, like x-rays or computed tomography (CT scans).

Reasons for the Procedure

An MRI may be ordered for further evaluation of signs or symptoms that may suggest atherosclerotic heart disease, cardiomyopathy, congenital heart disease, congestive heart failure, aneurysm, valvular heart disease, a cardiac tumor, or other conditions.

Risks of the Procedure

An MRI does not pose any risks unless you have any kind of implanted metal objects, such as a pacemaker, clips in the brain, medication pumps, or other implanted devices.

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