237. Robustness of FDG-PET radiomic features against tumor delineation in two clinical relevant scenarios

Purpose To assess the robustness of PET radiomic features (RF) against tumour/PET positive nodes (T/N) delineation uncertainty in two clinically relevant situations, namely head-and-neck (HNC) and pancreatic cancer. Methods Twenty-five HNC (T and N) and 25 pancreatic cancer (only T) patients previously treated with IMRT and 18FDG-PET/CT based planning optimization were included in the study. Seven contours were delineated for each lesion...