The recently developed technique of Cardiac CT Perfusion (CTP) gathers information on both coronary anatomy and myocardial perfusion in a single scan. This diagnostic test can detect the presence of coronary plaque as well as assess the functional significance of a stenosis. To date, it is estimated that 1000 cases of CTP have been performed in the world. While no exceptional adverse events have been reported (nor are expected), the image quality and clinical validation in a multi-center multi-vendor setting has been a marked issue for many experts in this nascent field. This issue has hampered the clinical utility of this test and raises concerns about its widespread utilization leading to unnecessary costs and exposure to radiation.