Angiography is the x-ray study of the blood vessels. Angiography requires the injection of a contrast dye that makes the blood vessels visible to x ray. The dye is injected through a procedure known as arterial puncture. The puncture is usually made in the groin area, armpit or inside elbow. Once a guide wire has been put in place, a fluoroscopy screen displays a view of the patient's vascular system. A contrast dye is then administered and x-ray pictures and/or fluoroscopy pictures (or moving x rays) will be taken as the dye will dissipate through the patient's system. Some types of angiography include cerebral angiography, coronary angiography, pulmonary angiography and kidney angiography.
Read more about CT Angiography and MR Angiography.