A new study reveals having a CT angiography test leads to more prescriptions for medications, more tests, and more procedures. However, the incidence of heart attacks or cardiac death among low-risk patients remained the same, regardless of whether they had a CT angiography test or not. Coronary computed tomographic (CT) angiography can detect plaque buildup in the heart vessels and is sometimes used as a screening tool to assess the risk of a heart attack.