CT coronary angiography (CTA) is a newly developed technique for non-invasive evaluation of coronary artery disease. CT scan is an X-ray procedure which, combined with iodine-based contrast agents, generates cross-sectional views of the heart and coronary arteries. The Emory Cardiac Imaging Center uses a state-of-the-art, multi-detector CT system to acquire high-resolution images of the heart and great vessels. This advanced technology is being used more and more to identify calcified and non-calcified plaques in the coronary arteries, or to exclude the possibility of stenosis (narrowing) due to atherosclerosis. Early stages of coronary atherosclerosis can be detected before the development of coronary arterial narrowing.