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ST: Fachverband Strahlen- und Medizinphysik

ST 5: Medical Imaging

ST 5.5: Talk

Tuesday, March 16, 2021, 17:00–17:15, STa

A novel Detector for PET-applications — •Simon Peters¹, Konstantin Bolwin², Björn Gerke², Volker Hannen¹, Christian Huhmann¹, Klaus Schäfers², Christian Weinheimer¹, Nils Marquardt¹, and Tim Engling¹ — ¹Institut für Kernphysik, WWU Münster — ²European Institute for Molecular Imaging, WWU Münster

Recently, a new type of PET detector has been proposed using a heavy organo-metallic liquid - TriMethyl Bismuth (TMBi) - as target material [1]. TMBi is a transparent liquid, 82% by weight of Bismuth. Due to the high Z number in Bismuth as the central atom of TMBi, 511 keV photons are converted efficiently to photo-electrons within the detector material. These photo-electrons produce both Cherenkov light and free charge carriers in the liquid. While the optical component enables a fast timing, a charge readout using a segmented anode can provide an accurate position reconstruction within the detector. The charge measurement requires a high level of purification, any electronegative contaminants can cause signal degradation and will produce noise within the detector. In addition to the purity requirements, the reactive nature of TMBi poses many challenges that need to be met until a fully functioning detector for PET applications can be realized. The talk will give an overview of the detection principle and discuss different purification techniques under investigation. This work is supported by the DFG, Project Number: WE 1843/8-1; SCHA 1447/3-1

[1] Yvon, D. et al. (2014). CaLIPSO: An novel detector concept for PET imaging.