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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 intensities in calibrated T1-w/T2-w images. 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. In agreement with the scaling algorithm, the calibrated T1-w/T2-w images exhibit comparable intensity scales with a reduced inter-subject variability for each dataset. Note the normalized frequency on the vertical scale obtained as the ratio of each subject-specific histogram to the total area beneath the curve.