Fig. 4.

Solutions obtained with the manual, single-distance arrays. In this example, the arrays obtained manually for all five ROIs and $nS=nD=8$ are depicted. In the upper row, sources are shown as red circles, detectors as blue circles, and channels in green. For each array, the number of viable channels, the absolute sensitivity of the array over the ROI, the relative sensitivity of the array over the ROI, and the relative coverage of the array are reported. The middle row displays the results on the GM surface. The area of the ROI covered by each array is shown in green, while any portion of an ROI that remains uncovered is shown in red. Brain areas that are covered but are outside of the ROI are shown in blue. The bottom row provides a histogram of the source–detector distances present within each array.