ESTRO 2024 - Abstract Book

S3983

Physics - Inter-fraction motion management and offline adaptive radiotherapy

ESTRO 2024

Conclusion:

Selection difference between clinical and consensus selection in a fractionated cervical cancer radiotherapy treatment resulted in smaller dose differences than the uncertainty of dose accumulation in OAR and target. However, selecting solely the default plan (i.e. full bladder plan) would result in less target coverage and higher dose to the rectum. This overdose in rectum could exceed the predefined clinical goals. Despite the differences between observers in treatment plan selection, the procedure for selecting the treatment plan is still considered sufficient in ensuring the appropriate radiotherapy dosage for both the target and the OAR.

Keywords: Library of Plans, Inter-observer variability, Dose

References:

(1) Bondar ML, Hoogeman MS, Mens JW et al. Individualized nonadaptive and online-adaptive intensity-modulated radiotherapy treatment strategies for cervical cancer patients based on pretreatment acquired variable bladder filling computed tomography scans. Int J Radiat Oncol Biol Phys 2012 August 1;83(5):1617-23. doi:10.1016/j.ijrobp.2011.10.011 (2) Heijkoop ST, Langerak TR, Quint S et al. Clinical implementation of an online adaptive plan-of-the-day protocol for nonrigid motion management in locally advanced cervical cancer IMRT. Int J Radiat Oncol Biol Phys 2014 November 1;90(3):673-9. doi:10.1016/j.ijrobp.2014.06.046 (3) Buschmann M, Maje, akova K et al. Image guided adaptive external beam radiation therapy for cervix cancer: Evaluation of a clinically implemented plan-of-the-day technique. Z Med Phys 2018 August;28(3):184-95. doi:10.1016/j.zemedi.2017.09.004

(4) Kainz K, Garcia AJ, Zhong H et al. Use of a DVH overlay technique for quality assurance of deformable image registration-based dose accumulation. Med Phys 2022 January;49(1):611-23. doi:10.1002/mp.15375

522

Digital Poster

Spine length reduction during the course of day in pediatric radiotherapy patients

Karin M. Meijer 1 , Irma W.E.M. van Dijk 1 , Tamara J. Schonk 1 , Niek van Wieringen 1 , Anna Loginova 2 , Arjan Bel 1

1 Cancer Center Amsterdam, Amsterdam UMC, University of Amsterdam, Radiation Oncology, Amsterdam, Netherlands. 2 Dmitry Rogachev National Research Center of Pediatric Hematology, Oncology and Immunology, Radiation Oncology, Moscow, Russian Federation

Purpose/Objective: