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. 2020 Apr 7;14:300. doi: 10.3389/fnins.2020.00300

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Copyright © 2020 Fantini and Sassaroli.

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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Sensitivity maps for absorption contrast of (A) single-slope intensity, (B) single-slope phase, (C) dual-slope intensity, and (D) dual-slope phase. The arrows pointing down indicate the light sources (S₁, S₂), and the arrows pointing up indicate the optical detectors (D₁, D₂). The color bar labels in panels (A,C) indicate the sensitivity to absorption perturbations for single slope DC intensity (S_{SSDC,μ_a}) and dual slope DC intensity (S_{DSDC,μ_a}), respectively. The color bar labels in panels (B,D) indicate the sensitivity to absorption perturbations for single slope phase (S_{SSφ,μ_a}) and dual slope phase (S_{DSφ,μ_a}), respectively. White and black in the color maps indicate values greater than the maximum or smaller than the minimum, respectively, of the color bars. Adapted with permission from Sassaroli et al. (2019)© The Optical Society of America.