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ize the acquisition.A 4D digital pelvic phantom was generated with a dynamic component consisting in an expanding bladder with 2 ureters and a static part consisting in the 2 kidneys, bone structures, and soft tissues. Projection data were obtained using an attenuated Radon transform function. Four acquisitions protocols were tested 32 projections of 16 seconds (32-16-1), 32 projections of 8 seconds (32-8-1), 2 consecutive SPECT of 32 projections of 4 seconds (32-4-2) and 2 consecutive SPECT of 16 projections of 8 seconds (16-8-2). The o