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Dose-reduced ASiR protocols compare (a) the mean NPS frequency shift as a function of level of ASiR reconstruction. An acceptable tolerance for the appearance of noise texture in the reconstructed image is reported in the literature [ref 4, 5, 20, 21] based on a 25% shift of NPS noise frequency (dashed line). (b) Corresponding reductions of CTDIvol for the protocols using ASiR are plotted and fit using a log-regression function.
