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. 2018 Dec 4;17:180. doi: 10.1186/s12938-018-0613-2

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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. 8 — a Raw HbO data (blue curve) relative to the low-passed filtered HbO (thick red curve) with 0.15 Hz cut-off frequency, b the power spectra of a that shows the existence of physiological noises