Fig. 5.

(a) The source-detector layout of the Gen-1 hand-held probe, with all fibers spaced 0.5 cm apart. The typical output intensity from each of the six simultaneous illumination sources (solid red circles) is shown. The mean and standard deviation of output source light intensity is $1.02\pm 0.937\mathrm{mW}$, making it a nonhomogenous source distribution. (b) The source-detector layout of each of the two probe heads of the Gen-2 imager. The typical output intensity from each of the (three each) simultaneous illumination sources (solid red circles) is shown. The mean and standard deviation of output source light intensity for the two probe heads is $2.01\pm 0.03\mathrm{mW}$ and $2.09\pm 0.06\mathrm{mW}$, making it a homogenous source distribution.