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ST: Fachverband Strahlen- und Medizinphysik
ST 2: Medical Imaging Concepts
ST 2.3: Vortrag
Dienstag, 21. März 2023, 17:30–17:45, ZEU/0146
Advancements in Energy Resolution for Positron Emission Tomography with light sharing Scintillation Crystals — •Matthias Bovelett1, Florian Müller1, Yannik Kuhl1, Stephan Naunheim1, David Schug1,2, and Volkmar Schulz1,2 — 1Department of Physics of Molecular Imaging Systems, RWTH Aachen University — 2Hyperion Hybrid Imaging Systems GmbH
Positron Emission Tomography (PET) is widely used in clinical and pre-clinical applications. Commercially available PET-detectors use arrays of segmented scintillators coupled to a SiPM matrix. Of current scientific interest are detectors using light sharing scintillators. In these, the scintillator covers multiple SiPM channels and, therefore, one gamma interaction shares the light among the optically coupled SiPM channels. Key parameters of the gamma interaction, i.e., interaction position, timing, and energy information, need to be reconstructed from the measured light distribution. To acquire a good energy resolution in PET it is necessary to filter out specimen scattered events, thereby reducing background, and improving the signal to noise ratio. This work presents a framework, in which a light sharing scintillator is divided in virtual voxels. For each voxel a dedicated energy calibration is performed. Different summation pattern of involved SiPM channels and their impact on the energy resolution are discussed, including events for which not all SiPM channels were read-out. For these "incomplete" light distributions (∼ 15% of all) imputation strategies are presented. Overall, the presented strategies result in an improvement from 14% to below 12% for energy resolution of all events.