ESTRO 2025 - Abstract Book

S3156

Physics - Inter-fraction motion management and offline adaptive radiotherapy

ESTRO 2025

Conclusion: IVD is able to reveal errors in patient setup and delivery of VMAT TBI treatments. Analysis of in vivo dosimetry results revealed slight criticalities in the pelvic area and arm positioning, which underscore the importance of better patient immobilization and suggest the adoption of strategies for gastro-intestinal organ and bladder preparation.

Keywords: Total Body Irradiation, In Vivo Dosimetry

References: 1 Hoeben, Bianca A W et al. “ESTRO ACROP and SIOPE recommendations for myeloablative Total Body Irradiation in children.” Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology vol. 173 (2022): 119-133. doi:10.1016/j.radonc.2022.05.027 2 Seravalli, Enrica et al. “Technical recommendations for implementation of Volumetric Modulated Arc Therapy and Helical Tomotherapy Total Body Irradiation.” Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology vol. 197 (2024): 110366. doi:10.1016/j.radonc.2024.110366

2925

Digital Poster Optimization of External Contours in Eclipse for Surface-Guided Radiotherapy with Exactrac Dynamic Ana Reguilón Martín 1 , Rodrigo Astudillo Olalla 2 , Rosa Fabregat Borras 1 , Marina Gutiérrez Ruiz 1 , Noelia Suarez Alvarez 1 , Jorge Alonso Muriedas 3 , Javier Uzquiza López 1 , Andrea Ropero Real 1 , Jose Andres Vázquez Rodriguez 1 , Uriel A Corro Verde 4 , Frandeina Pinto Guevara 4 , Mara García Lamela 4 , Francisco J Olloqui Urroz 4 , María Teresa Pacheco Baldor 1 1 Radiofísica, Hospital Universitario Marqués de Valdecilla, Santander, Spain. 2 Radiofísica y Protección Radiológica, Hospital Universitario de Navarra, Pamplona, Spain. 3 Radiofísica y Protección Radiológica, Hospital Universitario de Cruces, Baracaldo, Spain. 4 Oncología Radioterápica, Hospital Universitario Marqués de Valdecilla, Santander, Spain Purpose/Objective: During radiotherapy treatment administration, it is essential for patients to replicate the positioning established during the simulation Computed Tomography (CT) scan. Surface Guided Radioterapy (SGRT) techniques, enable the detection of the patient's surface using light projected and reflected to cameras. This approach allows for monitoring patient positioning and movement throughout treatment sessions.