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. Author manuscript; available in PMC: 2016 Jul 1.
Published in final edited form as: Eur Radiol. 2015 Apr 23;25(7):2089–2102. doi: 10.1007/s00330-015-3603-9

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ROI placement for objective noise measurement. Small red circles indicate location of ROIs, with two parenchymal sites (liver, A; left kidney, B), two fat attenuation sites (subcutaneous fat of left flank, C; right flank, D), and two colonic air column sites (transverse colon, E; rectum, F). ROIs were placed in homogeneous areas without vessels, soft tissue stranding etc.