Regensburg 2019 – wissenschaftliches Programm
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ST: Fachverband Strahlen- und Medizinphysik
ST 4: Poster session
ST 4.1: Poster
Dienstag, 2. April 2019, 14:00–16:00, Poster B1
investigation of intrinsic property of 4 layer DOI PET detector — •munetaka nitta1, giulio lovatti1, geroge dedes1, mohammad safari1, tim binder1, juliana martin1, peter thirolf1, taiga yamaya2, and katia parodi1 — 1Ludwig Maxmilians University, Munchen, Germany — 2National institutes for quantum and radiological science and technology, Chiba, Japan
We have started to design an in-beam PET system for the project of "small animal proton irradiator for research in molecular image-guided radiation-oncology (SIRMIO)". The PET system should be designed to image positron emitters induced by proton beam. To achieve both uniform high image resolution in field of view and high sensitivity, we require a PET detector with high spatial resolution and depth of interaction (DOI) information. As the structure of DOI PET detector, the 4-layer DOI PET detector which is developed by national institute of radiological science in Japan is a leading candidate for the PET system. As a scintillator, both LYSO and GAGG are candidates for the PET detector. LYSO is commonly used for PET detector but contains natural radioactive isotope of Lu-176 which provides random coincidence for PET measurement as noise event. Such noise events might not be negligible because of the limited number of induced positron emitters. Although density of GAGG is lower than LYSO, GAGG does not contains such natural radioactive isotope. In this study, we carried out optical Monte Carlo simulation of both LYSO and GAGG based 4-layer DOI PET detector to investigate dependency of scintillation material on intrinsic property of the PET detector by Geant4.