Table 1.

Summary of the optical properties of the two-layer phantoms used in this study for comparison with MC simulations. The scattering values are given for λ = 630 nm. For the absorbers: g is green dye; r is red dye; b is blue dye; and Hb is dissolved Hemoglobin powder. The largest source of uncertainty for the optical property values is due to errors in the pipette volumes required in order to create the liquid phantoms. The pipettes were calibrated; however, based upon vendor specifications, pipette volume uncertainties were calculated to result in approximately a 4% error in optical property values.

Phantom Number	μ′s(λ 0) (mm−1)	μa,t,max (mm−1)	μa,b,max (mm−1)
1	1.5	0.25 (b)	1.275 (r)
2	1.5	0.25 (r)	1.275 (b)
3	1.5	2.3 (b)	0.25 (g)
4	1.5	2.3 (g)	0.25 (b)
5	1.5	0.25 (b)	2.3 (g)
6	1.5	0.25 (g)	2.3 (b)
7	2.85	0.25 (r)	2.3 (b)
8	2.85	0.25 (b)	2.3 (b)
9	2.85	2.3 (r)	0.25 (b)
10	2.85	1.275 (g)	0.25 (r)
11	2.85	1.275 (g)	2.3 (r)
12	0.75	0.25 (r)	2.3 (g)
13	0.75	0.25 (r)	2.3 (g)
14	1.7	0	1 (Hb)
15	1.54	0	1.5 (Hb)