 CT technology is evolving at a rapid pace, with introduction of multidetector row CT scanners MDCT and electrocardiographic ECG gating resulting in increasing numbers of heart scans CTCA CT Coronary Angiography. CTCA provides a noninvasive alternative to conventional invasive coronary angiography ICA, which is considered the gold standard in the investigation of coronary disease. There has been a gradual increase in the utilization of CTCA for primary assessment of low and intermediate risk patients. However concerns regarding radiation exposure and diagnostic accuracy, especially in the highrisk group, have prevented its widespread dissemination. 