Table 1.

Tissue optical properties.

Tissue type	Absorption coefficient μa (mm−1)	Anisotropy coefficient g (no units)	Scattering coefficient μs (mm−1)	Reduced scattering coefficient ${\mu }_{\mathrm{s}}^{\prime }({\text{mm}}^{-1})$
Scalp	0.0170	0.89	7.8	0.858
Skull	0.0116	0.89	7.8	0.858
CSF	0.004	0.89	0.009	0.001
Brain	0.0178	0.89	9.1	1.0

Note: The reduced scattering coefficient ( ${\mu }_{\mathrm{s}}^{\prime }$) combines the scattering coefficient (μ_s) and the anisotropy coefficient (g) as ${\mu }_{\mathrm{s}}^{\prime }=(1-g){\mu }_{\mathrm{s}}$.