Fig. 3

Example radiation field. Example of a radiation field in a patient with primary prostate cancer (indicated by a green arrow) and one lymph node metastasis in the left pelvic area (indicated by a red arrow) who is eligible for external beam radiation therapy (EBRT) and participation in the study. The delivered physical EBRT dose is 70–77 Gy to the prostate (purple area with green arrow), 60 Gy to macroscopic lymph node metastases (purple area with red arrow), and 52.5 Gy to the RTOG-based elective pelvic nodal fields expanded to include all detected nodal metastases (pink area)