Fig. 2. Leiden score calculation.

Leiden score was calculated by summation of segment score quantified as plaque weight factor × stenosis weight factor × location weight factor, i.e., a right dominant system with a non-calcified plaque with < 50% stenosis in the Prox RCA (1 × 1.2 × 1) + a calcified plaque with > 50% stenosis in the distal right coronary artery (1 × 1.1 × 1.4) + a non-calcified plaque with < 50% stenosis in the Prox left anterior descending artery (3.5 × 1.2 × 1), so the Leiden score is 6.94. AL = anterolateral, Dist = distal, D1 = diagonal 1, D2 = diagonal 2, IM = intermediate, LAD = left anterior descending coronary artery, LCX = left circumflex coronary artery, LM = left main, L-PDA = left posterior descending artery, L-PL = left posterolateral, OM = obtuse marginal, Prox = proximal, RCA = right coronary artery, R-PDA = right posterior descending artery, R-PL = right posterolateral