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Fig. 1C. —64-year-old man with atypical chest pain. Percentage of interscan variability was 54%, 109%, and 70% for images calculated at 60%, 50%, and 40% of R-R interval, respectively (results based on evaluation of all coronary arteries). Images shown in different figure parts are consecutively reconstructed axial slices with 3-mm slice width and 1.5-mm overlap. Unenhanced MDCT images reconstructed at 50% of R-R interval and obtained with scan 1 show that artery is well visualized, but no calcium is detected (density, < 130 H). Calculated calcium mass value for entire left anterior descending artery is 0 mg. Apparent absence of calcium reflects presence of data gaps that can be explained only by rapid coronary motion.