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Magnetic resonance angiography (MRA) is a non-invasive diagnostic procedure that uses a combination of magnetic resonance technology (MRI) and intravenous (IV) contrast dye to visualize blood vessels. Contrast dye causes blood vessels to appear opaque on the MRI image, enabling the physician to visualize the blood vessels being evaluated. An MRA is often used to examine the heart and other soft tissues and to assess blood flow.