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Proceedings Paper

Temperature- and wavelength-dependent scattering of light during slow heating of porcine septal cartilage
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Paper Abstract

The response of cartilage tissue to thermal stress can be investigated indirectly by measuring changes in optical properties during heating. Temperature distributions in cartilage depend on the mode of heating. Laser irradiation of thick cartilage specimens results in non-uniform heating, causing asynchronous stress relaxation in different regions of the tissue. In contrast, slow heating of cartilage in a Rose chamber results in more uniform temperature profiles. In addition, the heating of tissue in a saline- (or mineral oil) filled Rose chamber eliminates dehydration effects that are commonly encountered during laser heating. The purpose of this investigation was to measure diffuse reflectance and diffuse transmittance of porcine septal cartilage tissue during slow heating. Diffuse reflectance and transmittance were measured using integrating sphere and lock-in detection techniques. Cartilage surface temperatures were estimated using a thermocouple and cold-junction compensator. Diffusely transmitted light was observed to decrease, plateau, and then increase, whereas diffusely reflected light was observed to increase, plateau, and then decrease. The change in slope for both transmitted and reflected light occurred at cartilage front surface temperatures of between 45 and 50 degree(s)C. The results suggest that changes in the optical properties of cartilage tissue occur due to a phase transformation during heating.

Paper Details

Date Published: 27 June 2002
PDF: 10 pages
Proc. SPIE 4617, Laser Tissue Interaction XIII: Photochemical, Photothermal, and Photomechanical, (27 June 2002); doi: 10.1117/12.472509
Show Author Affiliations
Reshmi Basu, Beckman Laser Institute and Medical Clinic (United States)
Sergio H. Diaz-Valdes, Beckman Laser Institute and Medical Clinic (United States)
Brian Jet-Fei Wong M.D., Beckman Laser Institute and Medical Clinic and Univ. of California/Irvine (United States)
Steen J. Madsen, Beckman Laser Institute and Medical Clinic and Univ. of Nevada/Las Vegas (United States)

Published in SPIE Proceedings Vol. 4617:
Laser Tissue Interaction XIII: Photochemical, Photothermal, and Photomechanical
Steven L. Jacques; Donald Dean Duncan; Donald Dean Duncan; Sean J. Kirkpatrick; Sean J. Kirkpatrick; Andres Kriete; Andres Kriete, Editor(s)

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