Table 2.

Optical properties of a human forehead and the optical silicone phantom used for the validation measurements.²⁴

Tissue	${\mu }_{a,680}$ (${\mathrm{mm}}^{-1}$)	${\mu }_{a,850}$ (${\mathrm{mm}}^{-1}$)	${\mu }_{s,680}^{\prime }$ (${\mathrm{mm}}^{-1}$)	${\mu }_{s,850}^{\prime }$ (${\mathrm{mm}}^{-1}$)
Human forehead	0.0109	0.0115	0.8235	0.7210
Silicone phantom	0.0104	0.0099	1.1093	0.9514