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Fig. 1B —Chest phantom study. Coefficient of variation (SD/mean count value of pixel counts) of lung parenchyma measured at five different slices on SPECT of standing phantom is gradually decreased and steady as number of continuous rotating repeated acquisition mode projection data sets increases. Value of 0.27 ± 0.06 on SPECT reconstructed from eight CRRA-mode projection data was almost equal to that of 0.26 ± 0.03 on SPECT of standing phantom obtained with step-and-shoot mode and total acquisition time of 8 minutes.