Table 2. Accuracy in recovering phantom optical properties in the diffusive regime at 635 nm.

True ${\mu }_a$(mm−1)	True $\mu {\text{'}}_{sx}$ (mm−1)	SDA-derived ${\mu }_a$(mm−1) (COVa)	SDA-derived $\mu {\text{'}}_{sx}$ (mm−1) (COV)	RMS
0.002	0.87	0.0021 (5%)	0.89 (2%)	3.8%
0.004	1.14	0.0043 (7.5%)	1.19 (5%)	6.4%
0.006	1.42	0.0059 (1.7%)	1.34 (5%)	3.7%

^aCOV: coefficient of determination, relative difference between the true and SFDI-derived values. RMS: root mean square error