An MRI uses strong magnetic fields, pulses of radio wave energy and computers to capture two- or three-dimensional images of organs and structures inside the body. In many cases, MRIs can produce information that cannot be seen on X-rays, ultrasounds or computed tomography (CT) scans.

MRIs can be performed on virtually any part of the body, including:

• brain and other organs
• spine
• blood vessels
• joints, muscles, tendons and ligaments
• other parts of the body

They are used to locate tumors, bleeding, infections, joint, bone or organ problems, as well as numerous other conditions. MRIs can help patients avoid biopsies, surgery and X-rays. But MRIs are not right for everyone. Certain conditions and factors make it unadvisable for some people to have MRIs.

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