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This work was part of the feasibility study of performing simultaneous PET and SPECT imaging with a microPET scanner. SPECT data were acquired with slit-slat collimation by inserting a slit-slat collimator into microPET's detector ring but were contaminated by 511 keV photons' down- scattered events from PET tracer. In this study, contribution of down-scattered events in Tc-99m energy window (135-145...
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