ESTRO 2025 - Abstract Book

S4112

RTT - Patient care, preparation, immobilisation and IGRT verification protocols

ESTRO 2025

For 16 out of 18 patients >90% of the fractions were treated with the OART technique within one hour, so the technique was successfully applied. Until date, all fractions of the ongoing patients were successful (week 3 of 5). No grade 4 or 5 acute adaptation-related toxicities were observed until date. Conclusion: With 2 weeks left for 2 patients, the RTT-led OART workflow is on track to meet the feasibility criteria. Future work aims to reduce fraction times to facilitate broader clinical implementation, and evaluates possible margin reductions.

Keywords: OART

References: [1] Remeijer et al. Leveraging IGRT towards a fast CBCT based online adaptive treatment for prostate plus lymph nodes, Radiother Oncol. 2024 May;194 Supplement 1, S4039-43.

2998

Digital Poster Feasibility of a scrotal cast in radiotherapy of male patients with anal cancer Nienke G. Leus, Anita Brummel-Meines, Marjan van Hezewijk, Karin Muller, Danique A. Scheltes, Wim Jansen, Mariska den Hartogh Radiotherapy, Radiotherapiegroep, Arnhem, Netherlands Purpose/Objective: Evaluation of an in-house developed positioning tool for the penis and scrotum during radiation therapy for male anal cancer patients. Material/Methods: An individualized cast (Figure 1) was made of thermoplastic. A concavity was created, in which the scrotum and penis were positioned and lifted, thereby smoothening the perineum to prevent potential dose build-up effect.