An MRA is Magnetic Resonance Angiography; it’s a vein scan. So from radiologyinfo.org: Angiography is performed using: x-rays with catheters computed tomography (CT) magnetic resonance imaging (MRI) In magnetic resonance angiography (MRA), a powerful magnetic field, radio waves and a computer produce the detailed images. MR angiography does not use ionizing radiation (x-rays). MR angiography may…