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Figure 4. Regression plot shows the absolute CaHA mass in 50 patients determined at multi-detector row CT with a 3-mm section width protocol (x axis) and with a 1.25-mm section width protocol (y axis). Linear correlation was calculated with the following equation: calcium mass at CT angiography equals 0.2 plus 1.11 multiplied by calcium mass at traditional coronary screening (r = 0.977, P < .001). CS = coronary screening, CTA = CT angiography.