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ST: Fachverband Strahlen- und Medizinphysik

ST 6: Radiation Monitoring and Dosimetry II

ST 6.3: Vortrag

Donnerstag, 30. März 2017, 10:15–10:30, JUR 1

Detection of Cherenkov Photons from Compton-Scattered Electrons for Medical Applications — Hedia Bäcker, •Reimund Bayerlein, Ivor Fleck, Waleed Khalid, Albert Walenta, and Ulrich Werthenbach — Universität Siegen

Modern nuclear medicine and radiation therapy require imaging systems for higher energy gamma rays up to several MeV, where common detectors show insufficient detection efficiency. So called Compton cameras use a low-Z-scattering material where the incident gamma creates a high energetic electron and an absorption-layer for the scattered gamma. The greatest challenge in this attempt is the simultaneous detection of electron and gamma. Therefore, a new detector concept is proposed using the detection of Cherenkov light created by Compton-scattered electrons.

Coincident detection of the Cherenkov photons on an array of Silicon Photomultipliers allows a reconstruction of the characteristic Cherenkov cone and therefore also the electron momentum direction. The track of the Compton electron carries a large part of the information on the incident gamma. Fast analog read out and a FPGA enable timing resolutions of less than a nanosecond.

Recent work on this new concept comprises light yield measurements of different scattering materials as well as coincident Cherenkov photon detection on a 4-times-4-SiPM-array. In this talk, first steps in the development of the detector will be presented.