Table 1.

Optical parameters of brain tissues at 670, 810, 850, 980, and 1064 nm. ${\mu }_s$, scattering coefficient (1/mm); $g$, anisotropy factor; ${\mu }_s^{\prime }$, reduced scattering coefficient (1/mm); and ${\mu }_a$, absorption coefficient (1/mm). All $g$ values marked with “—” are set to 0.89; ${\mu }_s$ (or ${\mu }_s^{\prime }$) marked with “—” are calculated by ${\mu }_s^{\prime }$ (or ${\mu }_s$) and $g$.

Tissues	670 nm				810 nm				850 nm
	${\mu }_s$	${\mu }_s^{\text{'}}$	${\mu }_a$	$g$	${\mu }_s$	${\mu }_s^{\text{'}}$	${\mu }_a$	$g$	${\mu }_s$	${\mu }_s^{\text{'}}$	${\mu }_a$	$g$
WM	40.1	—	0.07	0.85	38	—	0.092	0.87	35	—	0.10	0.87
GM	8.4	—	0.02	0.9	7.3	—	0.028	0.89	7	—	0.033	0.9
CSF	—	0.01	0.0004	—	—	0.01	0.0026	—	—	0.01	0.0420	—
Skull	—	1.19	0.0208	—	—	1.92	0.011	—	—	1.87	0.011	—
Vessels	31.5	—	0.13	0.989	28	—	0.11	0.990	27.5	—	0.15	0.99
Fat	—	1.21	0.00045	—	—	1.09	0.00054	—	—	1.064	0.00071	—
Muscle	7.65	—	0.054	0.93	—	0.704	0.028	—	—	0.667	0.03	—
Skin	—	2.42	0.056	—	—	2.18	0.045	—	—	2.043	0.04	—
Tissues	980 nm				1064 nm
	${\mu }_s$	${\mu }_s^{\text{'}}$	${\mu }_a$	$g$	${\mu }_s$	${\mu }_s^{\text{'}}$	${\mu }_a$	$g$
WM	31	—	0.11	0.88	30	—	0.105	0.88
GM	6	—	0.052	0.91	5.9	—	0.053	0.91
CSF	—	0.01	0.048	—	—	0.01	0.0144	—
Skull	—	1.73	0.022	—	—	1.61	0.019	—
Vessels	22	—	0.2	0.987	20	—	0.13	0.985
Fat	—	0.99	0.0014	—	—	0.945	0.0054	—
Muscle	—	0.58	0.049	—	—	$\sim 0.55$	$\sim 0.056$	—
Skin	—	1.85	0.028	—	—	2.03	0.017	—