Angiography is a medical test that helps physicians identify and treat medical conditions and diseases of the blood vessels. Angiography inspections produce pictures of main blood vessels in the body and can be done with one of three imaging technologies and, in some cases, contrast material is managed. Basically, MR angiography (MRA) uses a powerful magnetic field, radio waves and a computer to assess blood vessels and help recognize abnormalities or diagnose atherosclerotic (plaque) disease. This exam does not use ionizing radiation and may necessitate an injection of a contrast material called gadolinium, which is less probable to cause an allergic reaction than iodinated contrast factual.