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. 2023 Sep 12;3:1210931. doi: 10.3389/fnume.2023.1210931

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© 2023 Mortazi, Udupa, Odhner, Tong and Torigian.

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) and the copyright owner(s) 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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Schematic illustration of the calibration process. The image intensity scales of 4 images are shown on the top as dotted lines. The 5 key landmarks of each image are also marked on the intensity scale. The standard scale is shown at the bottom as a solid line. The position of p_m(I) when each of the 4 images is mapped linearly from their respective [p_α(I), p_β(I) to [s_min, s_max] of the standard scale is depicted on the standard scale as small vertical.