Coronary artery calcification (CAC) detected by CT is a recognized surrogate marker for cardiac events [1]. Studies have established that CAC score correlates with coronary atherosclerotic plaque burden, and it has been shown to be an independent predictor of coronary events [1]. CAC scans are often followed by coronary CT angiography (cCTA). Both CAC and coronary CT angiographic studies became possible with the technological innovations of multidetector CT in the past decade. The radiation dose associated with cCTA can be high depending on the type of cardiac scan mode (median, 12 mSv; range, 5–30 mSv) [2].