Why it is done?

'As compared to conventional angiography, CT coronary angiography is able to visualize coronary wall as well as the coronary lumen. Calcified and non calcified atherosclerotic lesions can be visualized in the coronary wall, and the resulting stenosis of vessels. Anatomic variations of coronary arteries, presence of calcified & soft plaques, Post stent and post graft patency can all be visualized in a single breath hold procedure with better patient compliance.