Figure 1. Anatomy used for Monte Carlo simulations and processing.

(A) Sagittal section (MNIx = −9 mm) through the segmented Colin27 head. Shades from white to dark gray are: scalp, skull, cerebrospinal fluid, white and gray matter, respectively. The inset shows the original, pre-eroded scalp on the same slice. (B) Location and orientation of the 3,555 photon injection points around the Colin27 scalp used for the Monte Carlo simulations. The injection vectors (yellow) are shown in relation to the scalp profile and underlying cortical surface (rendered brain). The nineteen standard locations in the International 10–20 System are highlighted in blue. (C) Colorized shells representing the masks used for depth sensitivity analysis (blue = scalp, green = skull, dark blue to pink = twenty-one ∼2.8 mm thick shells).