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Relationship between normal effective dose and reduced effective dose in studies comparing multiple dose levels. FBP, filtered back projection; IR, iterative reconstruction. The Somatom Definition Flash was obtained from Siemens Medical Systems, Forcheim, Germany; Aquilion One™, was obtained from Toshiba Medical System Co. Ltd, Ottowara, Japan; Brilliance iCT was obtained from Philips Healthcare, Best, Netherlands; Discovery™ HD 750 was obtained from GE Healthcare, Milwaukee, WI.
