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Fig. 2B —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). Invasive coronary angiogram corresponding to A confirms presence of stenosis in proximal RCA and proves absence of significant coronary artery stenosis in mid RCA.