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. 2019 Dec 26;14:237. doi: 10.1186/s13014-019-1447-1

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© The Author(s). 2019

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 — Cross-sectional/planar images of boxes with different FM acquired using different imaging modalities. a–b Volumetric X-ray scans, c MRI scans, and e–i Planar X-ray images. d Different fiducial markers used in this study, diameter x length