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. 2015 May 6;15:54. doi: 10.1186/s12890-015-0058-3

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© Wens et al.; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 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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Ratios between inspiration and expiration in three directions for patients and volunteers measured with MRI. The length ratios between inspiration and expiration in the cranial-caudal direction (white bars), anterior-posterior direction (black bars) and left-right direction (grey bars) are shown for individual patients and volunteers. Volunteers are numbered 1 to 6 and patients 7 to 16. The length ratios are calculated by dividing the median length during inspiration by the median length during expiration for each axis.