ESTRO 2025 - Abstract Book

S2636

Physics - Detectors, dose measurement and phantoms

ESTRO 2025

Similar patterns are found in the other conditions of field size and energies.

Conclusion: Combined k s and k pol can significantly affect the PDD scanning measurements in FFF beams, in particular with Semiflex-3D. An error close to 1% at large depths could be present, meaning an error of less than 0.3% relative to the dose at the depth of d max . Profiles present a clear discontinuity of the k s effect at the field edge.

Keywords: ion recombination, FFF, polarity

3536

Proffered Paper Experimental validation of Monte Carlo simulated beam quality correction factors kQ for monoenergetic carbon-ion beams Jessica Stolzenberg 1,2 , Pascal Saße 3 , Björn Poppe 3 , Hui Khee Looe 3 , Kilian Baumann 1,2,4 1 University Hospital Gießen-Marburg, Department of Radiotherapy, Marburg, Germany. 2 University of Applied Sciences, Institute of Medical Physics and Radiation Protection, Gießen, Germany. 3 University Clinic for Medical Radiation Physics, Medical Campus Pius Hospital, Carl von Ossietzky University, Oldenburg, Germany. 4 Marburg Ion Beam Therapy Center, MIT, Marburg, Germany