An angiography is a procedure to take an x-ray of an artery or arteries in the body. During this procedure, a special dye, referred to as a contrast dye, is injected through the artery. Once the dye is flowing through the artery, an x-ray can be taken to determine whether or not blood is flowing normally through the vessel.
An angiography can help to identify tumors, blood clots or atherosclerotic plaque that may be partially blocking blood flow. This technique can also be used to look at the blood vessels, the brain, neck (carotids), heart, aorta, chest or pulmonary circuit.