Coronary computed tomography angiogram (CTA), also known as multi-slice computed tomography (MSCT), cardiac CT or cardiac CAT; uses sophisticated CT technology in conjunction with intravenous contrast medium to produce high-resolution, 3-D images of the moving heart and major blood vessels by detecting the x-rays through the body.  These images help to assess the amount of plaque or calcium deposits which may be present in the artery walls.  The noninvasive angiogram procedure is completed within one minute compared to cardiac catheterisation.