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ST: Fachverband Strahlen- und Medizinphysik
ST 2: Detectors for Treatment Monitoring
ST 2.1: Vortrag
Dienstag, 17. März 2026, 16:15–16:30, KH 01.013
Online Range Monitoring in Heavy-Ion Therapy — •Sebastian Schroeder1, Devin Hymers1, Olga Bertini2, Johann Heuser2, Joerg Lehnert2, Christian Joachim Schmidt2, Stephan Brons3, and Dennis Muecher1 — 1University of Cologne, Cologne, Germany — 2GSI, Darmstadt, Germany — 3HIT, Heidelberg, Germany
Interaction Vertex Imaging (IVI) is a proposed method for online range verification during heavy-ion therapy to determine relative range shifts in Bragg peak position (BP) with a sub-mm precision as previous experiments at HIT in Heidelberg have shown. This allows to add a safety interlock during treatment, which pauses irradiation if an incorrect BP position is detected. IVI tracks the secondary ions produced by beam-patient reactions with a purpose-built tracking system that uses the sensors developed by GSI for the Compressed Baryonic Matter experiment. These highly segmented, double sided silicon strip detectors have a 58 µm pitch, and cover a large sensitive area of up to 72 cm2. In combination with the readout electronics count rates of up to 250 kHz per segment are capable. While the system has already shown its tracking performance at 2.35 MHz event rate with less than 0.002% pileup, there was so far no real online analysis. The technical aspects of IVI and online analysis, as well as tests using Muons and a 12C beam at clinical intensities will be discussed in this contribution.
Keywords: Range Monitoring; Heavy-Ion Therapy; Interaction Vertex Imaging; Particle Tracking; Silicon Strip Detectors