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. 2014 Sep 2;8:671. doi: 10.3389/fnhum.2014.00671

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Copyright © 2014 Ganzetti, Wenderoth and Mantini.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Histograms of T1-w/T2-w image intensities before calibration. Mean T1-w/T2-w histograms (with standard deviation in colored shade) are presented for the IXI 1.5 T (A), IXI 3 T (B), and KIRBY21 3 T (C) datasets. The three datasets have inconsistent T1-w/T2-w intensity values. (A) IXI 1.5 T dataset shows a relatively large inter-subject reproducibility with the smallest extent of standard deviation. (B) IXI 3 T dataset displays a similar trend with an increased standard deviation in correspondence to the gray matter peak. (C) KIRBY21 3 T dataset exhibits the greatest inter-subject variability especially in the right tail of the histogram.