The cost can range from about $100 to $400. CT angiography is a test that uses computed tomography to see if an artery is narrowed or blocked. It's different from a coronary calcium scan and may be best after you already have symptoms of heart disease and other test results are not clear. A calcium scan can give your doctor more information about your risk for heart disease. 2  If you have a high score, you and your doctor may decide to start or change treatment to lower your risk. 3  You could get a high score from the test even if your arteries do not have signs of heart disease.