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Proceedings Paper

Monte Carlo simulation of photon way in clinical laser therapy
Author(s): Iulian Ionita; Gabriel Voitcu
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Paper Abstract

The multiple scattering of light can increase efficiency of laser therapy of inflammatory diseases enlarging the treated area. The light absorption is essential for treatment while scattering dominates. Multiple scattering effects must be introduced using the Monte Carlo method for modeling light transport in tissue and finally to calculate the optical parameters. Diffuse reflectance measurements were made on high concentrated live leukocyte suspensions in similar conditions as in-vivo measurements. The results were compared with the values determined by MC calculations, and the latter have been adjusted to match the specified values of diffuse reflectance. The principal idea of MC simulations applied to absorption and scattering phenomena is to follow the optical path of a photon through the turbid medium. The concentrated live cell solution is a compromise between homogeneous layer as in MC model and light-live cell interaction as in-vivo experiments. In this way MC simulation allow us to compute the absorption coefficient. The values of optical parameters, derived from simulation by best fitting of measured reflectance, were used to determine the effective cross section. Thus we can compute the absorbed radiation dose at cellular level.

Paper Details

Date Published: 2 June 2011
PDF: 6 pages
Proc. SPIE 8092, Medical Laser Applications and Laser-Tissue Interactions V, 80920X (2 June 2011); doi: 10.1117/12.889989
Show Author Affiliations
Iulian Ionita, Univ. of Bucharest (Romania)
Gabriel Voitcu, Univ. of Bucharest (Romania)

Published in SPIE Proceedings Vol. 8092:
Medical Laser Applications and Laser-Tissue Interactions V
Ronald Sroka; Lothar D. Lilge, Editor(s)

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