Objective image quality
One radiologist with over 7 years of experience in cardiovascular radiology sketched the ROIs for evaluating the objective image quality. The mean CT number and the noise were measured on the proximal segment of the left anterior descending (LAD) artery, the distal segment of the right coronary artery (RCA), as well as the adjacent pericardial fat. The ROI size on the pericardial fat was 12 mm