An X-ray of the arteries and veins to detect blockage or narrowing of the vessels. During an arteriogram, a small incision is made in the groin. A thin, flexible tube (catheter) is then inserted into a blood vessel. Once the catheter is in place, a small amount of dye is injected in the artery. The dye allows the blood vessel to be seen on X-rays. After a series of X-rays are taken, the catheter is removed.