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GATE/Geant4 simulations are computationally demanding, requiring thousands of processor hours to produce realistic results. One of the difficulties in producing a truly parallel solution is that in PET simulations, events are NOT independent of each other completely. Photons that originate in a given time window must be simulated in the same processor so that they can be fed to the same coincidence...
Monte Carlo simulations are considered as naturally parallel, because many replications of the same experiment can be distributed on multiple execution units to reduce the global simulation time. However, one needs to take care of the underlying random number streams and ensure that the generated streams do not show intra or inter-correlations. Such errors occur in naive parallelizing approaches,...
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