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. 2018 Jul 17;5:180134. doi: 10.1038/sdata.2018.134

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Copyright © 2018, The Author(s)

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/ The Creative Commons Public Domain Dedication waiver http://creativecommons.org/publicdomain/zero/1.0/ applies to the metadata files made available in this article.

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SNR is the abbreviation for the signal-to-noise ratio. This ratio indicates the mean intensity within the grey matter divided by the standard deviation of the values outside the brain. Higher values are better. FBER is the abbreviation for the foreground to background energy ratio. This ratio indicates the variance among the voxels inside the brain divided by the variance among the voxels outside the brain. Higher values are better. Mean FD refers to the mean fractional displacement-Jenkinson. It is a measure of subject head motion that compares the motion between the current and previous volumes. Mean FD is calculated by summing the absolute value of the displacement changes in the x, y and z directions and rotational changes about those three axes. The rotational changes are given as distance values based on the changes across the surface of a sphere with a radius of 80 mm. Lower values are better.