Angiography video of a right upper limb venography x_ray of the veins in a 42_year_old patient with acute renal failure. This view shows the forearm and elbow. This procedure is used to explore the brachial veins through the injection of iodine. Angiography is an imaging technique in which a radio_opaque contrast medium is injected into blood vessels to allow them to be seen on an X_ray.