ESTRO 2023 - Abstract Book

S656

Monday 15 May 2023

ESTRO 2023

Results Significant differences in DVH parameters were observed between T0 and T1 (Fig 2). GA increased for esophagus Dmean, heart Dmean and heart V45Gy, showing better agreement at T1. EA increased for heart Dmean, V30Gy and V45Gy at T1. GA for PTV D0.03cc decreased at T1, which can be explained by a larger PTV volume for patient 2. GA and EA also decreased for lungs V5Gy. In this case constraint was easily reached and RTTs differently prioritized further decrease of V5Gy as it was not reflected in lungs Dmean decrease. At T2 RTTs showed good agreement in technical choices, dose to organs at risk remained equally good compared to T1 and PTV coverage improved significantly.