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. 2017 May 18;27(11):4680–4689. doi: 10.1007/s00330-017-4819-7

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© The Author(s) 2017

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. 1 — The three measurements of the airway and accompanying artery in a perpendicular view to the pathway centre-line, using an ellipse image analysis tool (Myrian®). The annotated surface areas of the inner (#3) and outer (#2) airway and of the artery (#1) were used to estimate diameters and to calculate the AA-ratios. The location of all AA-pairs was determined by using 3D segmentation (videos of rotating 3D segmentations in colour can be found in Online Supplementary Material E2)