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Positron Emission Tomography (PET) is a Nuclear Medicine technique thatcreates images that allow the study of metabolic activity and organ functionusing radiopharmaceuticals. Continuous improvement of scintillation detectorsfor radiation in PET as well as improvement in electronic detectors (e.g.,SiPMs) and signal processing, makes the field of PET a fast and changingenvironment. If industry desires to build new systems implementing thesetechnological improvements, it is of its interest to develop modellingstrategies that can provide information on how to build them, reducing time andmaterial costs. Bearing this in mind three different PET configurations, weresimulated in Geant4, to determine which one presented the best performanceaccording to quality parameters such as spatial resolution (SR), coincidenttime resolution (CTR) and acceptance value (A). This was done with threedifferent (in size) pairs of LYSO crystals + SiPM detectors. It was found thatthe 2 Modules system presented worst results than the two Ring detectorconfigurations. Between the Ring configurations the first was marginally betterthan the second.

Characterization in Geant4 of different PET configurations