Evaluation of the Delta-Eddington Approximation
This section compares solutions of the delta-Eddington approximation with
accurate adding-doubling and Monte Carlo solutions.
Heretofore comparisons have been for the index matched case, where the
delta-Eddington approximation was found to agree with exa ct solutions for
all optical depths, albedos and anisotropies [34]. This section
makes comparisions for mismatched boundary conditions because of the large
differences possible between fluence rates for identical tissues with
different boundary conditions (cf., Figure 4.1). The
following sections emphasize comparisons with an air-glass-tissue-glass-air
medium. Total reflection and transmission are compared in the first
subsection. This is followed by a comparision of the fluence rates for a
one-dimensional slab.
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