False-colour arteriograph (angiograph) of the abdominal aorta, the large, main artery of the body, showing the point in the lower abdomen where the aorta divides into the left & right iliac arteries that supply blood to the legs. Arteriography is an x-ray technique for studying an artery that has been outlined by prior injection of a radio-opaque contrast medium (ie the artery is rendered opaque to x-rays - the false-colour provides additional contast).