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Axial image data from the GE chest CT scan with a fixed 120 kVp tube voltage after an AP scout. The reference axial CT image with mean CT numbers (A) and corresponding 1SD noise map (B) were calculated from ten slices comprising a total z-direction volume coverage of 10 cm. Absolute CT number differences (C) and relative noise difference maps (D) at table heights +6, +3, -3, and -6 cm were calculated relative to the reference centering (0 cm).
