ESTRO 2024 - Abstract Book

S1137

Clinical - Haematology

ESTRO 2024

were 100% (range 100-100%) and 98.1% (range 95.5-99.4%), respectively for CT and MRI approach (see table 1 for the detailed analysis).

Conclusion:

Geometric similarity between segmentation was observed with slight differences, mainly due to CT underestimation of specific lymph node areas and imperfect co-registration of anatomical regions. Target volume coverage remains clinically reasonable due to historical PTV margins. MRI-based contouring approach could allow more accurate