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. 2016 Dec 12;19(4):499–511. doi: 10.1007/s11307-016-1026-x

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© The Author(s) 2016

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 4 — Comparisons of a, b a low contrast phantom displayed with level of 0 HU and a window of 400 HU and c, d a HA phantom displayed with a level of 1000 HU and a window of 3000 HU. The images were acquired with either a, c an 18 s, 22.4 mGy scan or b, d a 2 min, 130.4 mGy scan using 2 × 2 binning on the detector, a 90 kVp X-ray source voltage and the low physical magnification. Increasing the dose by increasing the scan time enables visualization of all four inclusions in the low contrast phantom. All four inclusions were visible in the HA phantom at either scan time.