CT Angio Carotid or computed tomography angiography is a computerized procedure that helps to visualize the arterial and venous vessels in the body. This includes viewing the arteries that supply blood from the brain to the kidneys, lungs, arms and legs. A CT scan also allows the technician to see narrow or blood vessel areas as well. This test also reveals if there is a bulge (aneurysm) or a fatty material buildup of blood vessels known plaque or not. The coronary arteries can also be viewed with this test. For this, the patient gets injected with an intravenous injection of radiocontrast allowing scan done by a high speed CT scanner to diagnose coronary artery disease.