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. 2021 Dec 11;12:185. doi: 10.1186/s13244-021-01132-0

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© The Author(s) 2021

Open AccessThis 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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Fig. 4 — Linear correlations between the normalized arterial intensities in Silent MRA and CBF determined using 2D PC-MRA. a Correlation between the normalized arterial intensities and the corresponding CBFs was highly linear (R² = 0.550). The dark grey area indicates the 95% confidence interval of the linearly fitted line. b At the individual participant level, normalized arterial intensity was also highly linearly correlated