We have developed a simulation to model position encoding multicrystal detectors for positron emission tomography. The simulation is designed to treat the interactions of energetic photons in a scintillator, the geometry of the multicrystal array, as well as the propagation and detection of individual scintillation photons. The simulation is tested with a model of the EXACT HR PLUS block detector manufactured by Siemens-CTI. Position and energy responses derived from the simulation are compared to measured ones. Line-spread-functions, for four columns of crystals, are reproduced with an accuracy of 50.5 111111. The crysta~-~y-crystal photopeak pulse heights and FWHM's are also predicted within a range of f14%, and ?i %, respectively.

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A bs tra c tWe report the results of design studies for a multicrystal detector with the capacity to encode the Depth-Of-Interaction (DOI). These stiidies are based on a simulation that treats the interactions of y-rays and tracks scintillation photons in state-of-the-art position encoding P E T detectors. The simulation was used to study the impact of a simple modification to the standard surface treatment of the EXACT FIR PLUS block that induces a significant sensitivity of the photopeak pulse height upon the DO1 of 511 keV y-rays. The depth resolution achieved with the altered block as well as the impact of the modification on its energy and position resolutions are presented. The results show a depth resolution of 6 to 7 mm for the inner crystals of the modified block. The center crystals show the largest increase in event position miscoding with 16% less encoding accuracy in the modified block compared to the original one

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