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(a) Background variability for 20 mm circular regions in the Abdo-Man phantom. The background variability in the case of data-driven or externally driven gating is significantly higher than the variability without gating (i.e. no correction) (p < 0.05). (b) Corresponding results for the NEMA IEC Body Phantom. Presented values are the mean from three replicates, with error bars representing the standard error on the mean.
