We compare two fundamentally different ways to evaluate the time
dependence in Monte Carlo simulations of photon
migration: estimating the pulse response in time versus evaluating
the transfer function at discrete points in the frequency
domain. We show that these two methods differ in accuracy owing to
quantization and sampling errors, whereas the statistical error is
essentially the same for both methods. From our analysis we also
derive alternative methods to sample the time-domain pulse response
with reduced quantization and sampling error. Simulation results
are included to illustrate our theoretical analysis.
© 1999 Optical Society of America
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