S1992
Physics - Dose prediction/calculation, optimisation and applications for photon and electron planning
ESTRO 2026
Conclusion: Results showed reasonable agreement among clinical teams for this case. No trend suggested better performance for intensity-based or hybrid DIR pipelines, although only hybrid DIRs generated plausible registrations for structures near the target. References: [1] Thiong‘o CM, Davey A, Appelt A, Day M, Dupuis P, Monti S, et al. Dose Mapping using Image Registration for Reirradiation: A Systematic Review.
International Journal of Radiation Oncology*Biology*Physics 2025.
https://doi.org/10.1016/j.ijrobp.2025.09.053.[2] Hardcastle N, Vasquez Osorio E, Jackson A, Mayo C, Aarberg AE, Ayadi M, et al. Multi-centre evaluation of variation in cumulative dose assessment in reirradiation scenarios. Radiother Oncol 2024;194:110184. https://doi.org/10.1016/j.radonc.2024.110184.[3] Murr M, Brock KK, Fusella M, Hardcastle N, Hussein M, Jameson MG, et al. Applicability and usage of dose mapping/accumulation in radiotherapy. Radiotherapy and Oncology 2023;182:109527. https://doi.org/10.1016/j.radonc.2023.109527 Keywords: reirradiation, dose accumulation, DIR Digital Poster 4311 Early clinical experiences with a new commercial VMAT solution utilizing dynamic collimator rotation and static ports Henna Hietala 1,2 , Sini Seppänen 1,2 , Sakari Karhula 1,3 , Timo Hakkarainen 1,2 , Piia Karppinen 1,2 , Juha Nikkinen 1,3 1 Cancer Center, Oulu University Hospital, Oulu, Finland. 2 Medical Research Center, University of Oulu, Oulu, Finland. 3 Research Unit of Health Science and Technology, University of Oulu, Oulu, Finland Purpose/Objective: To compare plan quality between a new commercial VMAT solution utilizing dynamic collimator rotation and static ports (RAD) and conventional volumetric modulated arc therapy (RA). Delivery parameters, dose volume histogram (DVH) extracted quantities and measurement were investigated. We commissioned RAD in early 2025 and started treatments without separate period for planning studies. Material/Methods: Planning case selection was based on clinical timelines selecting large volumes utilizing simultaneous integrated boost (SIB) and multiple arcs. Treatment plans were generated by a medical physicist with >10 years clinical experience. RAD plan was approved for treatment and RA plan was generated for comparison using the same optimization values (lower/upper volume/dose objectives, gEUD, normal tissue
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