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Journal of Biomedical Optics

Optical characteristics of cartilage at a wavelength of 1560 nm and their dynamic behavior under laser heating conditions
Author(s): Alexander P. Sviridov; Andrey V. Kondyurin
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Paper Abstract

A double-integrating-sphere system was used to measure the diffuse transmittance, diffuse reflectance, and collimated transmittance of cartilage and polyacrylamide hydrogel samples as a function of temperature under 1560-nm laser heating conditions. The dynamic behavior of the absorption and scattering coefficients and scattering anisotropy of the biomaterials was calculated by the inverse Monte Carlo method. The absorption coefficient of the cartilage and hydrogel samples proved to be linear in temperature. Raising the temperature of the cartilage samples to 80°C caused their absorption coefficient to decrease by some 25%. The temperature-induced change of the absorption spectrum of the interstitial water was found to be responsible for the clarification of the cartilage tissue observed to occur under 1560-nm laser heating conditions. The temperature field produced in the tissue by the laser energy deposited therein was calculated using a bioheat transfer equation with temperature-dependent parameters. The calculation results demonstrated that the temperature-induced changes of the optical parameters of biological tissues should be taken into account to make their 1560-nm laser treatment effective and safe.

Paper Details

Date Published: 1 September 2010
PDF: 8 pages
J. Biomed. Opt. 15(5) 055003 doi: 10.1117/1.3484749
Published in: Journal of Biomedical Optics Volume 15, Issue 5
Show Author Affiliations
Alexander P. Sviridov, Institute on Laser and Information Technologies (Russian Federation)
Andrey V. Kondyurin, Institute on Laser and Information Technologies (Russian Federation)


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