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. 2018 May 4;18:18. doi: 10.1186/s40644-018-0147-7

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© The Author(s). 2018

Open AccessThis 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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Mean CT value calculated using three-dimensional (3D) computer-quantified CT number analysis. a CT images show computer-generated tumor boundaries that were inspected and edited slice-by-slice by radiologist for correctness and consistency. b 3D image of the tumor generated automatically by the computer. c CT number distribution curve of the tumor. The mean CT value of this tumor is − 533 HU ranging from − 861 HU to 86 HU