Light propagation in random media can be described under rather general assumptions by a one-speed linear transport equation (BoLTzmANN-Equation)I,2. A general solution of this equation, in particular for the time-dependent case, has not been obtained yet. Various ap- proximation to this equation have been used in the past to treat the problem of light transport in turbid media for various geometries. Both time- and frequency-domain solutions for infinite media'--4, slab3,5 and cylindrical5,6 geometries have been reported.
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