Table 1.

Tissue optical properties.

Tissue type	Absorption coefficient ${\mu }_{\mathrm{a}}$$({\mathrm{mm}}^{-1})$	Anisotropy coefficient $g$ (no units)	Scattering coefficient ${\mu }_{\mathrm{s}}$$({\mathrm{mm}}^{-1})$	Reduced scattering coefficient ${\mu }_{\mathrm{s}}^{\prime }$$({\mathrm{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 (${\mu }_{\mathrm{s}}$) and the anisotropy coefficient ($g$) as ${\mu }_{\mathrm{s}}^{\prime }=(1-g){\mu }_{\mathrm{s}}$.