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. 2017 Aug 31;7:10187. doi: 10.1038/s41598-017-10504-w

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Three-dimensional CT analysis of the airways. (A) Three-dimensional image of the airway trees. (B) Longitudinal image of the reformatted airway. (C) Short axis image of the airway. Red and green lines indicate the outer and inner edges of the airways, respectively. The areas within the green line and between the red and green lines are the airway inner luminal area and wall area, respectively.