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Effect of low signal-to-background ratio on 4D-PET results. Comparison of nongated PET (blue), helical attenuation correction (AC)-gated PET (red), phase-matched (PM) (green)-gated PET, and Q.Freeze-gated (orange) to the static scan at a motion amplitude of 2 cm analyzed by max (A), peak (B), and mean (C). Error bars on the PM- and helical AC-gated images represent the standard deviation of the 6 bins.
