ESTRO 2023 - Abstract Book

S1623

Digital Posters

ESTRO 2023

Conclusion A linear correlation between leaf position changes of the MLC and the pseudo fluence is found for prostate cases. In future, the correlation between area change of the MLC field and the DPF will be further investigated, to take the blurring of DPF into account. This first patient study encourages the use of DPF as a predictor of necessary adaptive leaf shifts. Most probably it can be used to quickly adapt VMAT plans without the need for re-optimization of the treatment plans.

PO-1880 Real-time and online adaptive particle therapy in 10 years: a Delphi consensus analysis

P. Trnkova 1 , Y. Zhang 2 , T. Toshito 3 , B. Heijmen 4 , C. Richter 5 , M. Aznar 6 , F. Albertini 2 , A. Bolsi 2 , J. Daartz 7 , A. Knopf 2,8 , J. Bertholet 9 1 Medical University of Vienna, Department of Radiation Oncology, Vienna, Austria; 2 Paul Scherrer Institute, Center for Proton Therapy, Villigen, Switzerland; 3 Nagoya City University West Medical Center, Nagoya Proton Therapy Center, Nagoya, Japan; 4 Erasmus University Medical Center, Department of Radiotherapy, Rotterdam, The Netherlands; 5 OncoRay – National Center for Radiation Research in Oncology, Faculty of Medicine and University Hospital Carl Gustav Carus, Technische Universität Dresden, Helmholtz-Zentrum Dresden - Rossendorf, Dresden, Germany; 6 University of Manchester, Division of Cancer Sciences, Faculty of Biology, Medicine and Health, Manchester, United Kingdom; 7 Massachusetts General Hospital & Harvard Medical School, Department of Radiation Oncology, Boston, USA; 8 University for Applied Sciences and Arts Northwestern Switzerland, Institute for Medical Engineering and Medical Informatics, School of Life Sciences, Muttenz, Switzerland; 9 Inselspital, Bern University Hospital, Division of Medical Radiation Physics and Department of Radiation Oncology, Bern, Switzerland Purpose or Objective To collect experts’ opinion on the future of Online Adaptive Particle Therapy (OAPT) and Real Time Motion Management (RRMM) for a vision with a ten-year horizon. Materials and Methods Following the POP-ART PT survey on current status [1], the present 3-round Delphi consensus study addresses the future of OAPT and RRMM with a panel of 11 experts using questionnaires. Second and third rounds were adapted based on the answers from the previous round to generate controlled opinion feedback (Figure 1). Full consensus (FC) or partial consensus (PC) were reached when all experts agreed or only one expert had a different opinion, respectively.