Hamburg 2016 – wissenschaftliches Programm
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ST: Fachverband Strahlen- und Medizinphysik
ST 5: Radiation Therapy I
ST 5.5: Vortrag
Mittwoch, 2. März 2016, 17:45–18:00, VMP6 HS C
Investigation of Prompt Gamma Emission for Online Range Verification in Proton Therapy — •Laurent Kelleter1, Judith Besuglow1, Karim Laihem1, Johannes Leidner1, Andrzej Magiera2, Grzegorz Obrzud2, Kasia Rusiecka2, Aleksandra Wronska2, and Achim Stahl1 — 1Physics Institute 3B, RWTH Aachen University, Aachen, Germany — 2Institute of Physics, Jagiellonian University, Cracow, Poland
A promising approach towards online range verification in particle therapy is the analysis of the prompt gamma radiation, emitted by several nuclear processes.
Using a High Purity Germanium detector (HPGe) we investigate the prompt gamma radiation for different phantom materials and thicknesses at different proton beam energies. The HPGe detector is mounted on a rotation system in order to measure the angular distribution. Analysis is focused on inelastic scattering of protons on carbon, proton induced spallation of oxygen and inelastic scattering of protons on oxygen.
We observe significant variations of the gamma rate within one millimeter phantom thickness. Furthermore, the gamma rate changes by up to 50% at different observation angles. A critical decrease of the signal-to-noise ratio is observed at beam energies in the upper half of the energy range of clinical relevance (150-250 MeV/u).