Table 2.

Phantom results of accuracy of fitted second layer properties. The first layer properties are calibrated or true values given in the first column. The ranges of fitted properties from the smaller probe were given in the first column as well.

First layer (unit: ${\mathrm{cm}}^{-1}$)	Second layer (unit: ${\mathrm{cm}}^{-1}$)
		1. ${\mu }_a=0.1$, ${\mu }_s^{\prime }=9.0$	2. ${\mu }_a=0.2$, ${\mu }_s^{\prime }=8.0$
1. ${\mu }_a=0.02$, ${\mu }_s^{\prime }=4.0$ Fitted ${\mu }_a$ (range: 0.018 to $0.035{\mathrm{cm}}^{-1}$) Fitted ${\mu }_s^{\prime }$ (range: 3.2 to $5.0{\mathrm{cm}}^{-1}$)	${\mu }_a$${\mu }_s^{\prime }$	88.3% 75.3%	80.0% 70.0%
2. ${\mu }_a=0.05$, ${\mu }_s^{\prime }=6.0$ Fitted ${\mu }_a$ (range: 0.045 to $0.058{\mathrm{cm}}^{-1}$) Fitted ${\mu }_s^{\prime }$ (range: 5.3 to $8.2{\mathrm{cm}}^{-1}$)	${\mu }_a$${\mu }_s\text{'}$	85.0% 56.9%	83.3% 53.8%
3. ${\mu }_a=0.05$, ${\mu }_s^{\prime }=9.0$ Fitted ${\mu }_a$ (range: 0.048 to $0.060{\mathrm{cm}}^{-1}$) Fitted ${\mu }_s^{\prime }$ (range: 7.7 to $11.0{\mathrm{cm}}^{-1}$)	${\mu }_a$${\mu }_s\text{'}$	80.0% 61.9%	82.5% 64.6%