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. Author manuscript; available in PMC: 2009 Jan 21.
Published in final edited form as: IEEE Trans Biomed Eng. 2008 Jan;55(1):335–339. doi: 10.1109/TBME.2007.910685

Table II.

Unconstrained and Constrained Recovered Optical Properties and the Corresponding χ2Values of Two-Layer Phantoms with 1-mm Thick Top Layer at the Wavelength of 785 nm. The Upper Bound and Lower Bound Were Set at the Optical Properties of the Top Layer (μa = 0.031/mm and μ′s = 2.14/mm for Light Skin Phantoms, and μa = 0.097/mm and μ′s = 1.87/mm for Dark Skin Phantoms) and the Substrate (μa = 0.005/mm and μ′s = 1.10/mm), Respectively, When Determining Constrained Optical Properties

3mm s-d separation probe 1.6mm s-d separation probe
Light Skin Phantom (1mm) Dark Skin Phantom (1mm) Light Skin Phantom (1mm) Dark Skin Phantom (1mm)
unconstrained constrained unconstrained constrained unconstrained constrained unconstrained constrained
Recovered μa (1/mm) 0.039 0.031 0.095 0.089 0.026 0.026 0.089 0.077
Recovered μs' (1/mm) 2.82 1.91 2.39 1.87 1.94 1.94 2.02 1.87
χ2 0.66 4.7 0.9 4.8 0.72 0.72 0.68 0.91