Table 2.

Optical properties of SCI rat’s tissue for 660, 810, and 980 nm light [28,29,30,31]. The refractive indices (n) for the tissues were assumed to be 1.37.

Tissue type	660 nm			810 nm			980 nm
	μa	μs	g	μa	μs	g	μa	μs	g
Skin	0.0340	25.80	0.900	0.0195	19.20	0.900	0.045	14	0.900
Muscle	0.0870	8.61	0.900	0.0270	6.87	0.900	0.051	5.56	0.900
Soft tissue	0.0890	13.23	0.900	0.0212	10.16	0.900	0.164	7.955	0.900
Bone	0.0100	15.23	0.900	0.0070	13.28	0.900	0.021	11.93	0.900
Spinal cord	0.0216	15.47	0.900	0.0134	11.13	0.900	0.0405	8.184	0.900
Blood (SpO2>98%)	0.1500	87.61	0.983	0.4000	76.10	0.983	0.68	62.68	0.9798

^∗The unit of both absorption coefficient (μa) and scattering coefficient (μs) are in mm-1