Regensburg 2019 – wissenschaftliches Programm
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ST: Fachverband Strahlen- und Medizinphysik
ST 3: Gamma Imaging
ST 3.1: Vortrag
Dienstag, 2. April 2019, 10:15–10:30, Kunsthalle
Coincident Detection of Cherenkov Photons from Compton Scattered Electrons for Medical Applications — Hedia Bäcker1, •Reimund Bayerlein1, Ivor Fleck1, Todd Peterson2, and Ayman Salman1 — 1Universität Siegen, Deutschland — 2Vanderbuilt University, Nashville, USA
There has been an increasing interest in an efficient gamma detector for medical applications: Proton beam therapy and nuclear medicine could benefit from the ability to detect higher energetic gamma-radiation (>1MeV). One possible detector would be a Compton Camera. Coincident detection of energy and position of both the electron and the scattered gamma allows to reconstruct the incoming gamma momentum to lie on the surface of a cone. Intersection of many cones yields information on the gamma source location. A novel concept for the detection of the high energetic Compton-scattered electron is proposed. 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. 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 coincidence timing resolution is in the order of 250 ps. Spatial sensitivity for the electron source location will be demonstrated using accumulated and single coincident events. The influence of radiator material and thickness will be presented together with a comparison of obtained results with theoretical estimations.