ESTRO 2024 - Abstract Book

S4353

Physics - Intra-fraction motion management and real-time adaptive radiotherapy

ESTRO 2024

Keywords: dose accumulation, auto-segmentation, MRgRT

References:

[1] Kawula M, Hadi I, Nierer L, Vagni M, Cusumano D, Boldrini L, et al. Patient-specific transfer learning for auto segmentation in adaptive 0.35 T MRgRT of prostate cancer: a bi-centric evaluation. Med Phys. 2023 Mar;50(3):1573 85. http://doi.org/10.1002/mp.16056. [2] Ribeiro MF, Marschner S, Kawula M, Rabe M, Corradini S, Belka C, et al. Deep learning based automatic segmentation of organs-at-risk for 0.35 T MRgRT of lung tumors. Radiat Oncol. 2023 Aug 14;18(1):135. http://doi.org/10.1186/s13014-023-02330-4. [3] Rabe M, Palacios MA, van Sornsen de Koste JR, Eze C, Hillbrand M, Belka C, et al. Comparison of MR-guided radiotherapy accumulated doses for central lung tumors with non-adaptive and online adaptive proton therapy. Med Phys. 2023 Feb 22. http://doi.org/10.1002/mp.16319.

Acknowledgement: Wilhelm Sander-Stiftung 2019.162.2

2504

Digital Poster

Evaluation of Set-Up Position Changes During Online Adaptive Therapy

Öznur Şenkesen 1 , Burcin İspir 2 , İrem Aydın 2 , Evrim Tezcanlı 3 , Sedenay Oskeroglu 2 , Ufuk Abacıoğlu 1 , Meriç Şengöz 1

1 Acıbadem Mehmet Ali Aydınlar University, Radiation Oncology Department, Istanbul, Turkey. 2 Acıbadem Ataşehir Hospital, Radiation Oncology Department, Istanbul, Turkey. 3 Acıbadem Altunizade Hospital, Radiation Oncology Department, Istanbul, Turkey

Purpose/Objective:

Online adaptive radiation therapy (ART) has emerged as an advanced treatment strategy, utilizing cone-beam computed tomography (CBCT) for real-time treatment planning. However, the time-consuming nature of contouring, quality assurance, scheduling, and adaptive plan creation poses challenges in clinical practice. In accordance with our clinical protocol, set-up corrections are performed with a secondary CBCT scan after the adaptive plan phase just before treatment. This study aims to investigate the changes in patient position and their implications on the necessity of the secondary CBCT scan