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. 2016 Apr 25;11:47. doi: 10.1186/s13018-016-0382-1

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© Chen 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. 3 — MRI T2W image of cauda equina (a) and FA mapping of DTI of cauda equina (b). ROIs were placed on the cauda equina on the zones equally as the disc, including superior 1/3, middle 1/3, and inferior 1/3 of the disc on FA mapping and FA values were calculated (b). The minimum values of three zones were taken as FA values of the cauda equina; MRI T2W image of bilateral nerve roots (c) and FA mapping of DTI of bilateral nerve roots (d). ROIs were placed on the “intraspinal,” “intraforaminal,” and “extraforaminal” zones of bilateral nerve roots on FA mapping and FA values were calculated (d). The minimum values of three zones were taken as FA values of the nerve roots. MRI magnetic resonance imaging, FA fractional anisotropy, DTI diffusion tensor imaging