Quantitative estimate of spatial/temporal variations in the optical properties of tissue-like media from diffuse reflectance data

We have measured relative diffuse reflectance images on tissue-like liquid phantoms using a laser diode (784 nm, 40 mW) as a broad-beam source and a CCD camera detector. We have found that, to a good approximation, the result that the reflectance R only depends on the ratio of the absorption and reduced scattering coefficients of the medium (μa/μs') can be extended to geometrical configurations that are more general than those considered by theoretical studies. In fact, over the range 0.0028