A 47-year-old woman was referred for a coronary CT angiography (64-slice scanner, Toshiba Aquilion, Tustin, California, USA). Retrospective ECG-gated datasets were acquired (collimation, 64×0.5 mm; table feed per rotation, 7.2 mm; rotation, 400 ms; tube voltage, 120 kV; and tube current, 500 mA). Using a segmented image reconstruction algorithm, a temporal resolution of <100 ms was achieved. Before scan, the heart …