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Fig. 1E. —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 CT images reconstructed at 40% of R-R interval and obtained with scan 1 show left anterior descending artery with several calcific plaques. Calculated calcium mass value for entire left anterior descending artery was 4 mg.