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. 2021 Aug 14;40(2):147–158. doi: 10.1007/s11604-021-01187-5

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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. 2 — The result of the test–retest study using the standard diffusion tensor image (DTI) sequence. The results of the test–retest study for evaluating the bilateral ALPS index using the standard DTI sequence and large spherical region of interest for four measurements in each of the seven study subjects. Data 1a and 1b were measured sequentially on the same day, and Data 1c and 1d were measured sequentially on a different day. The intraclass correlation coefficient for these measurements was 0.828, which means almost perfect agreement