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Fig. 2B. —Corresponding axial MDCT images obtained in 60-year-old woman imaged twice with an identical prospectively ECG-triggered sequential scanning protocol. Measurement of total calcification was highly variable (62%) between scan 1 (A) and scan 2 (B) primarily because of differences in amount of calcium detected in left anterior descending coronary artery (arrow). Resulting difference in total Agatston score (10.3 for scan 1) and (5.4 for scan 2) did not correspond to difference in patient's risk stratification.