Bonn 2020 – wissenschaftliches Programm
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ST: Fachverband Strahlen- und Medizinphysik
ST 7: Radiation Therapy and Detector Physics
ST 7.6: Vortrag
Donnerstag, 2. April 2020, 15:15–15:30, H-HS II
Detection of Compton Electrons for Medical Applications Using Cherenkov Light — •Reimund Bayerlein, Hedia Bäcker, Ivor Fleck, and Jona Bensberg — Universität Siegen, Deutschland
A novel principle for the electron measurement in a Compton Camera - used for the detection of higher energetic photons (≥1 MeV) in medical applications - is presented. Using coincident detection of Cherenkov photons generated by the electron in an optically transparent radiator material an estimation of the scattering vertex, the electron energy and momentum is possible. Requirements and challenges of this concept will be discussed. A proof of principle is presented showing the coincident detection of Cherenkov photons created by electrons in PMMA on a 8x8 Silicon-Photomultiplier array. The single photon timing resolution (SPTR) is on the order of 485 ps. The number of detected Cherenkov photons can be counted using the signal’s Time over Threshold information. Spatial sensitivity for the electron source location from accumulated and single coincident events will be presented and compared to extensive simulations using Geant4. The ability to detect actual Compton scattered and photo electrons using Cherenkov light will be demonstrated using 511 keV photons from a 22Na source. The efficiency for the detection of higher energetic photons with this new concept as well as the resolution of the electron energy and the applicability in a Compton Camera will be discussed.