Computed tomography (CT) is becoming increasingly more important in the diagnosis of cardiac disease. As more hospitals purchase scanners for cardiac CT, more cardiologists are learning how to interpret the scans. This issue is geared to helping cardiologists understand and adopt this new modality. It includes articles on CT angiography, evaluation of the coronary atherosclerotic plaque, evaluation of heart valves, and electrophysiology applications of CT, among others.