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Figure 2 Coronary Artery Tree Model Depicting Coronary Artery Plaque Scores

Segment stenosis score was calculated by summation of moderate plaque in the proximal right coronary artery (2) + mild plaque in the proximal left anterior descending artery (1) + moderate plaque in the mid left anterior descending artery (2) + severe plaque in the proximal right coronary artery (3). In this example, the segment stenosis score is 8 out of a possible 48. Segment involvement score was calculated by summation of the absolute number of coronary segments exhibiting plaque, i.e., the proximal right coronary artery (1) + proximal left anterior descending artery (1) + mid left anterior descending artery (1) + proximal right coronary artery (1). In this example, the segment involvement score is 4 out of a possible 16. Three-vessel plaque score was calculated as a binary variable to indicate the presence or absence of 3-vessel coronary artery plaque. Three-vessel plaque score was considered positive if there was concurrent presence of plaque in the left anterior descending artery, left circumflex artery, and right coronary artery. In this example, the 3-vessel plaque score is 1 out of a possible 1. Severe proximal plaque score was measured by presence of severe plaque in the proximal portion of the left anterior descending artery, left circumflex artery, or right coronary artery. In this example, the severe proximal plaque score is 1 out of a possible 3. Left main plaque is measured by any plaque within the left main artery. In this example, the left main plaque score is 0 out of a possible 1.