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Proceedings Paper

Theoretical modeling of heating and structure alterations in cartilage under laser radiation with regard to water evaporation and diffusion dominance
Author(s): Emil N. Sobol; Moishe S. Kitai; Nicholas Jones; Alexander P. Sviridov; Thomas E. Milner; Brian Wong
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Paper Abstract

We develop a theoretical model to calculate the temperature field and the size of modified structure area in cartilaginous tissue. The model incorporates both thermal and mass transfer in a tissue regarding bulk absorption of laser radiation, water evaporation from a surface and temperature dependence of diffusion coefficient. It is proposed that due to bound- to free-phase transition of water in cartilage heated to about 70 degrees Celsius, some parts of cartilage matrix (proteoglycan units) became more mobile. The movement of these units takes place only when temperature exceed 70 degrees Celsius and results in alteration of tissue structure (denaturation). It is shown that (1) the maximal temperature is reached not on the surface irradiated at some distance from the surface; (2) surface temperature reaches a plateau quicker that the maximal temperature; (3) the depth of denatured area strongly depends on laser fluence and wavelength, exposure time and thickness of cartilage. The model allows to predict and control temperature and depth of structure alterations in the course of laser reshaping and treatment of cartilage.

Paper Details

Date Published: 13 May 1998
PDF: 10 pages
Proc. SPIE 3254, Laser-Tissue Interaction IX, (13 May 1998); doi: 10.1117/12.308207
Show Author Affiliations
Emil N. Sobol, Research Ctr. for Technological Lasers (Russia)
Moishe S. Kitai, Research Ctr. for Technological Lasers (United States)
Nicholas Jones, Queen Medical Ctr./Univ. of Nottingham (United Kingdom)
Alexander P. Sviridov, Research Ctr. for Technological Lasers (Russia)
Thomas E. Milner, Beckman Laser Institute and Medical Clinic (United States)
Brian Wong, Beckman Laser Institute and Medical Clinic (United States)

Published in SPIE Proceedings Vol. 3254:
Laser-Tissue Interaction IX
Steven L. Jacques; Jeff Lotz, Editor(s)

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