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. 2018 Jun 18;17:82. doi: 10.1186/s12938-018-0507-3

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© The Author(s) 2018

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. 2 — The boundary fitted curve of thyroid nodule. The thyroid nodule boundary and boundary fitted curve, where the black solid line is the nodule boundary and the red dashed line is the elliptic curve fitted based on this boundary