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Proceedings Paper

New approach to Monte Carlo simulation of photon transport in the frequency domain
Author(s): Ilya V. Yaroslavsky; Anna N. Yaroslavsky; Hans-Joachim Schwarzmaier M.D.; Garif G. Akchurin; Valery V. Tuchin
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Paper Abstract

The time-dependent equation of the radiative transport is reduced to the stationary one for the case of a radiation source being modulated by a harmonic frequency. A Monte Carlo scheme is suggested to solve the resulting equation. The technique avoids tracking the time-histories of each individual photon and allows us to take the finite single-scattering transient time into account. The algorithm directly estimates the quantities being relevant to frequency-domain measurements. A single set of photon trajectories can be used to compute the modulation and the phase of the scattered radiation at different modulation frequencies. The results of the Monte Carlo simulations are compared to predictions of the rigorous radiative transport theory and the diffusion approximation. It is found that the Monte Carlo technique provides a good agreement with the transport theory whereas the accuracy of the diffusion approximation decreases with growth of the modulation frequency. In addition, the technique is used to study the effect of the finite single-scattering transient time on the resulting modulation and phase distribution of the diffusely reflected radiation. It is shown that even a transient time as short at 0.1 ps can significantly affect the reflected signal from a medium presenting optical properties similar to those of biological tissues in the near-infrared spectral range.

Paper Details

Date Published: 18 December 1995
PDF: 11 pages
Proc. SPIE 2626, Photon Propagation in Tissues, (18 December 1995); doi: 10.1117/12.228688
Show Author Affiliations
Ilya V. Yaroslavsky, Heinrich-Heine-Univ. (Germany)
Anna N. Yaroslavsky, Heinrich-Heine-Univ. (Germany)
Hans-Joachim Schwarzmaier M.D., Heinrich-Heine-Univ. (Germany)
Garif G. Akchurin, Saratov State Univ. (Russia)
Valery V. Tuchin, Saratov State Univ. (Russia)

Published in SPIE Proceedings Vol. 2626:
Photon Propagation in Tissues
Britton Chance; David T. Delpy; Gerhard J. Mueller, Editor(s)

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