Fig. 12.

The cW effect. In this example are depicted the arrays obtained by solving the Array Designer problem with GRASP for ROI 3, using $nS=nD=8$, and varying $cW$. In the upper row, sources are shown as red circles, detectors as blue circles, and channels in green. For each array, the time taken, 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.