An angiography or angiogram is a special type of X-ray that allows your coronary arteries to be viewed and recorded on film. This X-ray allows your doctor to see if the blood vessels to your heart are clogged. CAG is usually performed from the hand (Radial Angioplasty) but sometime its done from groin too (Femoral Angioplasty).
Blood vessels do not show clearly on a normal X-ray, so a special dye needs to be injected into your blood first. This highlights your blood vessels, allowing your doctor to see any problems. The X-ray images created during angiography are called angiograms.