An angiogram is a special type of X-Ray using dye to show if there is narrowing of the coronary arteries. The coronary arteries supply the heart with blood. Narrowing or blockage in these arteries can cause chest pain (angina) or heart attack. This test can also detect problems with the heart valves, or the pumping action of the heart. The result of the test will help your cardiologist plan the best treatment for you. If the test shows a narrowing or blockage, it may be treated with coronary angioplasty/stenting or bypass surgery.