Magnetic Resonance Angiography (MRA), Aortic Arch and Descending Thoracic Aorta — With or Without IV Contrast

What is this test?

Magnetic resonance angiography, or MRA, uses magnetic fields and radio waves to produce detailed pictures of blood vessels. This examination evaluates the aortic arch and the descending thoracic aorta, which carries blood from the heart through the chest.

Why might I need this test?

A clinician may order this test to investigate suspected aortic narrowing, an aneurysm, a tear in the aortic wall, or an aortic valve problem. It may also be used to assess blood flow before and after a procedure involving the aorta.

How is the test performed?

You lie on a moving table inside an MRI scanner while images of the aorta are taken. The test may be performed with or without intravenous contrast, depending on the examination ordered. A breath-holding instruction may be given briefly while images are captured.

How do I prepare for the test?

Follow the imaging center's instructions and tell the staff about kidney disease, prior contrast reactions, claustrophobia, implanted devices, or metal in your body. If contrast will be used, you may need blood tests or a contrast allergy assessment; fasting is usually not required unless specifically requested.