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Fig. 2C. —44-year-old asymptomatic man (heart rate, 68 beats per minute). Transaxial images from first electron beam CT (EBCT) (A), first 1.25-mm-thickness MDCT (B), and first 2.5-mm-thickness MDCT show heart. Calcium is not detected on EBCT and 2.5-mm-thickness MDCT. Calcium in left main coronary artery is detected on 1.25-mm-thickness MDCT.