Dortmund 2021 – wissenschaftliches Programm
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ST: Fachverband Strahlen- und Medizinphysik
ST 1: Radiation Therapy
ST 1.3: Vortrag
Montag, 15. März 2021, 16:30–16:45, STa
Characterization of pixelated silicon detectors for the measurement of small radiation fields in proton therapy — •Isabelle Schilling1, Claus Maximilian Bäcker1,3,4,5, Christian Bäumer2,3,4,5, Carina Behrends2,3,4,5, Kevin Kröninger1, Beate Timmermann3,4,5,6, and Jens Weingarten1 — 1TU Dortmund, Experimentelle Physik IV, 44221 — 2TU Dortmund, Fakultät Physik, 44221 — 3Westdeutsches Protonentherapiezentrum Essen, 45122 Essen — 4Westdeutsches Tumorzentrum, 45122 Essen — 5Universitätsklinikum Essen, 45122 Essen — 6Universitätsklinikum Essen, Klinik für Partikeltherapie, 45122 Essen
In order to achieve a high-dose irradiation while sparing normal tissue, small fields generated by pencil beam scanning or beam shaping apertures are increasingly used in proton therapy. These irradiation methods require the development of small field dosimetry systems for quality assurance. Applying the knowledge from high energy physics it becomes apparent that 2D pixelated silicon detectors with a good spatial resolution, a high rate capability and an electronic readout enabling the counting of single protons could meet these requirements. To assess their applicability in proton therapy ATLAS pixelated silicon detectors are used to measure lateral beam profiles of different irradiation modes at the WPE Essen. The measured beam profiles of a single pencil beam spot matches the expectations within ± 4 %. Further measurements underline the possibility to investigate the dose gradient at the field edges with high resolution. Analysis strategies to determine the residual proton energy are currently being worked on.