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Proceedings Paper

Modeling of light diffusion in tissues by a Monte Carlo method
Author(s): Livia Sterian; Camelia Blaja; Andreea-Rodica P. Sterian; C. Dordia; Mihai C. Piscureanu
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Paper Abstract

Most of the latest achievements concerning laser energy transfer through tissues is based on transport theory instead of Maxwell equations, due to the biological tissue inhomogeneities. The diffusion model we have described takes into account several tissue layers, with different optical properties, different refractive indices at their boundaries and anisotropic scattering. The algorithm has been implemented as a function which uses as parameters the simulation data (number of photons, maximal depth, analysis radius, depth and radius resolution) and also the optical characteristics of tissue layers. Our results refer to the simulation of light propagation through a single tissue layer. We have studied the optical properties of two tissue samples, of half-infinite surface, 1 cm in depth, which were irradiated with a very thin and uniform laser beam. We computed the average values of six simulations of 1000000 photons package each, for a vertical and horizontal resolution of 100 points. For a distance from the laser beam greater than 0.1 cm, the reflectances are approximately the same, while the transmittances are significantly identical at high depths inside the tissue. Our results are in good agreement with the experimental measurements, thus showing the utility of the method for several tissue layers studies.

Paper Details

Date Published: 4 November 2003
PDF: 5 pages
Proc. SPIE 5226, 12th International School on Quantum Electronics: Laser Physics and Applications, (4 November 2003); doi: 10.1117/12.519583
Show Author Affiliations
Livia Sterian, Univ. Politehnica of Bucharest (Romania)
Camelia Blaja, Univ. Politehnica of Bucharest (Romania)
Andreea-Rodica P. Sterian, Univ. Politehnica of Bucharest (Romania)
C. Dordia, Univ. Politehnica of Bucharest (Romania)
Mihai C. Piscureanu, Univ. Politehnica of Bucharest (Romania)

Published in SPIE Proceedings Vol. 5226:
12th International School on Quantum Electronics: Laser Physics and Applications
Peter A. Atanasov; Alexander A. Serafetinides; Ivan N. Kolev, Editor(s)

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