Hamburg 2016 – scientific programme
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ST: Fachverband Strahlen- und Medizinphysik
ST 5: Radiation Therapy I
ST 5.4: Talk
Wednesday, March 2, 2016, 17:30–17:45, VMP6 HS C
Geant4 Simulation to Determine the Bragg-Peak Position in Proton Therapy — •Judith Besuglow1, Sabine Feyen1, Laurent Kelleter1, Karim Laihem1, Johannes Leidner1, Andrzej Magiera2, Grzegorz Obrzud2, Achim Stahl1, and Aleksandra Wrońska2 — 1Physics Institute III B, RWTH Aachen University, Aachen, Germany — 2Institute of Physics, Jagiellonian University, Cracow, Poland
As protons become frequently used for cancer treatment, online control of the dose distribution gains in importance. Prompt gammas emitted during nuclear processes in the irradiated tissue are potential messenger particles for the dose distribution.
We investigate a correlation between gamma yield and Bragg-peak position. Phantoms were irradiated with a proton beam and the resulting spectrum was recorded by a germanium detector with an active Compton shield.
The current setup is modelled in Geant4 to provide correction factors for the calculation of cross sections and investigation for possible upgrades for future measurements. Assessments of the detection efficiency as a function of gamma energy and the efficiency of the Compton shield are presented.