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. 2020 Oct 6;20:367. doi: 10.1186/s12883-020-01945-4

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© The Author(s) 2020

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 2 — MRI measurements illustration. a: transverse spinal canal area (subarachnoid space); b: Transverse spinal cord area; c: Central_Ratio and Compression_Ratio are calculated as follows: Central_Ratio = CSD / TD, Compression_Ratio = SD / TD. (SD = sagittal spinal cord diameter, TD = transverse spinal cord diameter, CSD = Central sagittal diameter of the spinal cord); d: 1/4-Lateral_Compression_Ratio is calculated as follow: 1/4-Lateral_Compression_Ratio = (LQSD + RQSD) / 2TD. (RQSD = 1/4-lateral anteroposterior diameter on the right side, LQSD = 1/4-lateral anteroposterior diameter on the left side)