Berlin 2024 – wissenschaftliches Programm

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ST: Fachverband Strahlen- und Medizinphysik

ST 3: Radiation Therapy II

ST 3.2: Vortrag

Dienstag, 19. März 2024, 11:15–11:30, PC 203

Geant4 Simulation of the CBM Silicon Strip Detector for Interaction Vertex Imaging — •Sebastian Schroeder, Devin Hymers, and Dennis Mücher — Institut für Kernphysik, Universität zu Köln, Germany

Interaction vertex imaging (IVI) is a method which can be used to determine relative range differences in Bragg peaks in heavy-ion therapy. Current treatment plans must account for uncertainties in Bragg peak position on the order of millimeters. The sub-millimeter precision of IVI reduces the overall treatment uncertainty and allows further reduction of dose to healthy tissue. Previous studies suggest that to achieve IVI under clinical conditions, large sensitive detectors will be required to operate at high event rates of order MHz [1]. One possible detection system uses the double sided silicon strip detectors and fast readout electronics developed for the Compressed Baryonic Matter (CBM) experiment at GSI (Gesellschaft für Schwerionenforschung). To evaluate the suitability of this system, an IVI setup was simulated using the Geant4 Monte Carlo toolkit. The resultant event rates and cluster sizes, when compared to the capability of various readout configurations, are an order of magnitude lower than the limit of the CBM detection system. When energy cuts relevant for IVI are applied, the simulation shows that 98% of detected events correspond to particle species of interest, further demonstrating the suitability of this system for range monitoring in heavy-ion therapy under clinical conditions.

[1] Hymers et al 2021 Phys. Med. Biol. 66 245022

Keywords: Geant4; Interaction Vertex Imaging; CBM detectors; Simulation; Range verification