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. 2016 May 5;15:49. doi: 10.1186/s12938-016-0164-3

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© Li et al. 2016

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. 5 — The phantom nodules. a The appearance of the phantom; b interior of the phantom; c nodule models in the phantom (5 mm in diameter, from −406 to −477 HU); d the corresponding CT image (lung from −618 to −726 HU)