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Fig. 2A —56-year-old man with known coronary artery disease. Average heart rate was 66.1 beats/min and heart rate variability was 5.9 beats/min. Image quality of 64-MDCT coronary angiography was rated good in proximal and distal segments of right coronary artery (RCA). Curved planar CT image along centerline of RCA suggests presence of coronary stenosis in proximal RCA (arrowhead); severe blurring in middle segment (arrow) results in nonevaluable image quality (score 4).