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Image noise of SAFIRE 3 Q30f reconstructions of the COPDGene 2 phantom at different tube voltages. Dots represent the noise levels for individual repetitions at each dose level. Lines connect the average noise levels for EID (blue) and PCD (red) at each dose level. PCD noise was significantly lower than EID at the lowest dose setting for all tube voltages. **: P<0.05.
