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. 2018 Jan 17;18:9. doi: 10.1186/s12883-018-1016-5

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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. 1 — Grades of SN echogenicity by Transcranial ultrasound. Grade I: the same as brainstem; Grade II: with scattered points and thin lines slightly stronger than brainstem; Grade III: with patches of moderate echogenicity but weaker than brain pool; Grade IV: with patches of hyper echogenicity as the same as brain pool; Grade V: with patches of hyper echogenicity stronger than brain pool.