Erlangen 2026 – wissenschaftliches Programm
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ST: Fachverband Strahlen- und Medizinphysik
ST 3: Detectors for Medical Applications
ST 3.5: Vortrag
Mittwoch, 18. März 2026, 14:45–15:00, KH 01.013
Fast beam monitoring for ion beam therapy with an HV-CMOS detector system — •Thomas Renkhoff1, Alexander Dierlamm1,2, Ulrich Husemann1, Markus Klute1, Ivan Perić2, and Bogdan Topko1 — 1Institute of Experimental Particle Physics (ETP), Karlsruhe Institute of Technology (KIT) — 2Institute for Data Processing and Electronics (IPE), Karlsruhe Institute of Technology (KIT)
Ion beam therapy is a well-established cancer treatment available at more than one hundred centers worldwide. Compared to more common photon-based radiation therapy, ion beam therapy allows for more precise dose deposition into the tumor volume. A conformal dose deposition to the tumor volume requires a beam monitor that needs to be fast, radiation tolerant and should have a low material budget to reduce the beam particle scattering.
To meet these requirements we are developing a beam monitor based on HitPix sensors. The HitPix sensors are monolithic active pixel sensors produced in high-voltage CMOS technology. HV-CMOS technology comes with several advantages, including high radiation tolerance, thin sensors and better affordability compared to hybrid pixel detectors. HitPix sensors feature hit-counting pixels with on-sensor hit projection-calculation, radiation tolerance and frame-based readout.
The talk evaluates readout speed and performance after irradiation of the HitPix sensors. In order to test beam parameters, a quasi-online reconstruction, the estimator block, is integrated into the existing FPGA-firmware and tested.
Keywords: ion beam therapy; beam monitoring; HV-CMOS; monolithic pixels