Table 1. Optical parameters of gray matter.

Variable	Parameter	Wavelength	Value	Units
${\mu }_a$	absorption coefficient	920	0.039	1/mm
		1280	0.078	1/mm
		1320	0.12	1/mm
${\mu }_s$	scattering coefficient	920	6.7	1/mm
		1280	3.2	1/mm
		1320	3.2	1/mm
$g$	anisotropy coefficient	All	0.9	dimensionless
$n$	refractive index	All	1.36	dimensionless