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Average time needed to modify contours of 11 cardiac substructures per patient for the first 10 patients (clear bars) and for the second 10 patients (solid bars). Error bars represent one standard deviation. Abbreviations: LA, left atrium; LV, left ventricle; RA, right atrium; RV, right ventricle; SVC, superior vena cava; IVC, inferior vena cava; PA, pulmonary artery; PV, pulmonary vein; DA, descending aorta; AA, ascending aorta.
