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Dose-volume histogram analyses of modified contours (solid lines) are compared with auto-segmented contours (dotted lines) for the two patients (a) and (b) shown in Figure 2. Both patients were treated with passive scattering proton beam therapy. 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.
