Dortmund 2021 – wissenschaftliches Programm

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ST: Fachverband Strahlen- und Medizinphysik

ST 12: Compton Cameras

ST 12.4: Vortrag

Donnerstag, 18. März 2021, 16:45–17:00, STa

Gamma Ray Imaging Using a Cherenkov-Based Compton Camera Set-up -- A Simulation Study — •Reimund Bayerlein^1,2, Sophia Denker¹, and Ivor Fleck¹ — ¹Center for Particle Physics Siegen, Experimentelle Teilchenphysik, Universität Siegen — ²Department of Radiology, University of California Davis, CA, United States

A novel Cherenkov-based Compton camera concept for gamma ray imaging in the MeV range is presented using a Geant4 simulation study. The highly energetic Compton electron is detected via its Cherenkov light emitted in an optically transparent radiator block. The conically emitted Cherenkov light is detected with Silicon Photomultiplier (SiPM) arrays , which allows to draw conclusions on the electron's energy, momentum direction and Compton vertex. The energy and position of the scattered gamma is detected using LaBr 3 scintillators. A coincident detection of the scattered gamma together with the Compton electron allows to confine the origin of the gamma to a point on a 2D image plane. This concept was investigated for various incident gamma ray energies, and different distances between gamma source and camera. An altered source geometry was tested as well. The first results predict a reconstruction efficiency of up to 0.6% of the incident gamma rays with an energy of 1.5 MeV. A spatial resolution on the order of 2mm was achieved for point-like gamma sources. The presented work might show the way towards a working Compton camera prototype using Cherenkov-based electron detection.