MR angiography (MRA) uses a powerful magnetic field, radio waves and a computer to evaluate blood vessels and help identify abnormalities. This exam does not use radiation and may require an injection of contrast material. The contrast material used for MRA is less likely to cause an allergic reaction than the contrast material used for computed tomography (CT).

Tell your doctor about any health problems, recent surgeries, allergies and whether you are pregnant. The magnetic field is not harmful, but it may cause some medical devices to malfunction. Most orthopedic implants pose no risk, but you should always tell the technologist if you have any devices or metal in your body. Sometimes, your doctor will give you a card with information about your implant. Give this to the technologist. Guidelines about eating and drinking before your exam vary between facilities. Unless your doctor tells you otherwise, take your regular medications as usual. Leave jewelry at home and wear loose, comfortable clothing. You may be asked to wear a gown. If you have a fear of close spaces or anxiety, consider asking your doctor for a mild sedative prior to the exam.

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Doctors use angiography to diagnose and treat blood vessel-related diseases. Angiography exams produce pictures of major blood vessels throughout the body. In some cases, contrast material is used.

Doctors perform angiography using:

• fluoroscopy (x-rays) to help place catheters into blood vessels and inject contrast to help visualize them
• computed tomography (CT)
• magnetic resonance imaging (MRI)

In magnetic resonance angiography (MRA), a powerful magnetic field, radio frequency waves and a computer are used to evaluate blood vessels and help identify abnormalities. This exam, like all MR-based exams, does not use radiation.

An MRA exam may or may not use contrast material. If needed, an injection of a gadolinium-based contrast material may be used. Gadolinium is less likely to cause an allergic reaction than the iodinated contrast material used in CT angiography. The doctor or the technologist will usually administer the contrast material by placing a small intravenous (IV) catheter in a vein in your arm.

Doctors use MRA to examine blood vessels in key areas, including the: Brain, neck, heart, chest, abdomen (such as the kidneys and liver), pelvis, legs and feet, arms and hands
identify abnormalities, such as aneurysms, in the aorta, both in the chest and abdomen, or in other arteries. detect atherosclerotic (plaque) disease in the carotid artery of the neck, which may limit blood flow to the brain and cause a stroke.
identify a small aneurysm or arteriovenous malformation (AVM)—an abnormal connection between blood vessels—inside the brain or elsewhere.
detect plaque disease that has narrowed the arteries to the legs and help prepare for endovascular intervention or surgery.
Detect disease in the arteries to the kidneys or visualize blood flow to help prepare for a kidney transplant or stent placement.
Look at congenital abnormalities in blood vessels, especially arteries in children (e.g., malformations in the heart or other blood vessels due to congenital heart disease).
Evaluate stenosis and obstructions of vessels.
Screen individuals for arterial disease, especially patients with a family history of it.
MRA is also used as a substitute for CT angiography when iodinated contrast material cannot be used.

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