ESTRO 2024 - Abstract Book

S3388

Physics - Detectors, dose measurement and phantoms

ESTRO 2024

of the Roos chamber can be considered negligible within the uncertainty of the results.The observed behavior detector response can be almost entirely attributed to the contributions of the electrons, where the trajectories of the electrons originated from outside and inside the air volume are influenced differently by the Lorentz force. The valuable insights from this investigation can contribute to better understanding of detector’s behavior in magnetic field in future works.

Keywords: MRgRT, Monte Carlo, GATE

References:

[1] Fuchs, H., Padilla-Cabal, F., Zimmermann, L., Palmans, H. and Georg, D.: MR-guided proton therapy: Impact of magnetic fields on the detector response, Med. Phys., 48 (2021), S. 2572-2579

3074

Poster Discussion

Dosimetric analysis of a synchroton-based proton and carbon ion beamline for FLASH experiments

Larissa Derksen 1 , Klemens Zink 1,2,3 , Sebastian Adeberg 2,3 , Christina Stengl 4,5,6 , Tengda Zhang 7,8 , Joao Seco 7,9 , Kilian Simon Baumann 1,2,3 1 University of Applied Sciences, Institute of Medical Physics and Radiation Protection, Giessen, Germany. 2 University Medical Center Giessen-Marburg, Department of Radiotherapy and Radiooncology, Marburg, Germany. 3 Marburg Ion-Beam Therapy Center, Medical physics, Marburg, Germany. 4 German Cancer Research Center, Medical Physics in Radiation Oncology, Heidelberg, Germany. 5 University of Heidelberg, Faculty of Medicine, Heidelberg, Germany. 6 National Center for Radiation Research in Oncology, Heidelberg Institute for Radiation Oncology, Heidelberg, Germany. 7 German Cancer Research Center, Biomedical Physics in Radiation Oncology, Heidelberg, Germany. 8 University of Heidelberg, Medical Faculty Mannheim, Mannheim, Germany. 9 University of Heidelberg, Faculty of Physics and Astronomy, Heidelberg, Germany

Purpose/Objective:

The aim of this study is to report dosimetric characteristics applying FLASH dose rates using a synchrotron-based proton and carbon ion beamline at the Marburg Ion-Beam Therapy Center (MIT). This serves a preparatory work for further experiments investigating the effects of FLASH dose rates regarding radiochemistry and cell survivals

Material/Methods:

Ultra-high dose rates were achieved by extracting pencil beams of high particle intensity levels in a time interval of approximately 100 ms using protons of an energy of 81 MeV and 221 MeV and of approximately 150 ms using carbon