A cardiac CT scan for coronary calcium is a non-invasive way of obtaining information about the presence, location and extent of calcified plaque in the coronary arteries—the vessels that supply oxygen-containing blood to the heart muscle.

CT Scan (Computerized Axial Tomography) consists of many radiographs shot at the same time from different angles. Later, a computer gathers all the images and reconstructs them in only one image, summing up the images obtained from the different angles.