A dual interpretation of experimental data concerning the propagation of laser light through tissue-like turbid media
2010
The propagation is investigated of a continuous laser beam through homogeneous tissue-like turbid media such as diluted
emulsions of Intralipid or milk having presumably sharply forward directed Henyey-Greenstein or Gaussian indicatrices.
The cross sectional radial distributions of the detected forward-propagating light power at different depths along the
beam axis in each medium of interest are experimentally determined. The detected-power spatial distribution, for both
the types of indicatrices, is also described analytically by a solution of the radiative transfer equation in the so-called
small-angle approximation. The experimental results are consistent with the analytical expressions obtained that are
shown to allow one to estimate the extinction ( αt), reduced-scattering (αrs) and absorption (αa) coefficients and the gfactor
of the investigated media. The values obtained of α quite reasonable and
behave, depending on the dilution turbidity, in a way observed formerly in other similar experiments. The comparative
analysis of the estimated characteristics of the dilutions shows that in the case of Henyey-Greenstein indicatrix we have a
smaller value of the g-factor and larger value of αrs with respect to the case of Gaussian indicatrix. At equal g-factors, in
the former case we shall have a narrower forward-propagating scattered-light beam with higher on-axis intensity as
compared with the latter case.
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