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. 2020 Oct 27;10:18299. doi: 10.1038/s41598-020-74680-y

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© The Author(s) 2020

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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(A) Correlation of cerebral blood flow (CBF) and arterial transit time (ATT) from repeated measurements of ten subjects in gray and white matter. The solid line is the identity function and represents optimal correlation. (B) Agreement (Bland–Altman plot) between test and retest CBF and ATT from values shown in (A). The mean differences between both scans in gray and white matter are represented by the dashed line and dotted lines display the corresponding limits of agreement ( $1.96 \times$ standard deviations of mean differences).