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. 2017 Mar 9;7:119. doi: 10.1038/s41598-017-00239-z

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© The Author(s) 2017

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Axial slice at the level of the ventricles of a non-contrast CT acquired with 220 mAs exposure (left), the first time point of the 4D CT at 200 mAs, and the weighted temporal average of the 4D CT at a total exposure of 2250 mAs. All images are visualized with the same window level and width of 60 and 120 HU.