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. 2011 Feb 23;2(3):680–695. doi: 10.1364/BOE.2.000680

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©2011 Optical Society of America

This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 Unported License, which permits download and redistribution, provided that the original work is properly cited. This license restricts the article from being modified or used commercially.

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Fig. 4. — (a)–(d) 3D coronal views of the anatomical head model including the extra-cerebral vasculature (in black) and the regions of activation B and C (in gold) superimposed with optical arrays 1 and 2, respectively. Sources and detectors are represented by red and blue dots, respectively. (e)–(f) Corresponding recovered changes in oxyhemoglobin concentration ΔC_HbO for source-detector distances of 30 and 45 mm, respectively. Four values are illustrated and correspond to: (blue) true change (9µMol/ℓ) simulated in the region of activation, (cyan: Sinus-PPL) change recovered using the head model containing the extra-cerebral vasculature and the partial pathlength, (yellow and dark red) changes recovered when the vasculature was not taken into account and using the partial pathlength (NoSinus-PPL), and the total differential pathlength (NoSinus-DPL).