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. 2018 Jan 19;8:1242. doi: 10.1038/s41598-018-19668-5

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Correlations between the rCBF ratio and several NIRS/ICG parameters (BFI ratio, ΔICGmax ratio, TTP ratio, and RT ratio) are shown (a). Correlations between the rOEF ratio and NIRS/ICG parameters are also demonstrated (b). Among the parameters of the NIRS/ICG, the BFI ratio shows the best correlation with the rCBF ratio (|r| = 0.618, P = 0.0004), and the RT ratio shows the best correlation with the rOEF ratio (|r| = 0.593, P = 0.0007).