Conclusions
Measurements of the reflection and transmission of light as a
function of angle allow direct measurement of the single-scattering
phase function. It has been shown that these measurements are
directly proportional to the phase function for very thin samples.
Correction factors for reflection and refraction at boundaries
have been presented. The method for measuring the phase function
has been evaluated using reflection and transmission values computed
with the adding-doubling method. Calculation of the anisotropy
factor
gHG is insensitive to boundary conditions and values of
the isotropy factor  .
In contradistinction, the values for
the isotropy factor
were very sensitive to thickness and boundary
conditions--leading to a systematic overestimation of the isotropy
factor which could be corrected using Figure 5.9. Experimental
measurements on human dermis indicate that the Henyey-Greenstein
phase function accurately models the phase function with anisotropy
coefficient
gHG=0.92, =0.05 and an average cosine of the phase
function
 .
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