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Proceedings Paper

Optical properties of tissues after laser treatments in the wavelength range of 350 - 1000 nm
Author(s): Katsunori Ishii; Akinori Kimura; Kunio Awazu
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Paper Abstract

In laser medicine, the accurate knowledge about the optical properties of target tissue is important for the understanding prediction of propagation and distribution of light in tissues. Light propagations, absorption and scattering, changes by the kinetic changes of optical properties in laser irradiations. This problem is clinically very important for the realization of safe laser treatments because the understandings of optical properties by several laser parameters can realize the pre-estimated treatment effects. The objective of this study is determination of the optical properties of treated tissues for the safe laser treatments. In this paper, we examined to determine the optical properties changes of a coagulated tissue after the Er:YAG laser irradiations by using double integrating sphere system and inverse adding-doubling method in the wavelength range of 350 - 1000 nm. After laser irradiations with a variety of irradiation parameters, the absorption coefficient of a treated tissue decreased and the reduced scattering coefficient of a treated tissue increase. In carbonization, observed in 30 sec-300 mJ irradiation, the absorption coefficient of a treated tissue re-increased and the reduced scattering coefficient of a treated tissue re-decrease. The changes of optical properties should be accounted for while planning the therapeutic procedure for the realization of safe laser treatments.

Paper Details

Date Published: 2 May 2008
PDF: 7 pages
Proc. SPIE 6991, Biophotonics: Photonic Solutions for Better Health Care, 69912F (2 May 2008); doi: 10.1117/12.781607
Show Author Affiliations
Katsunori Ishii, Osaka Univ. (Japan)
Akinori Kimura, Osaka Univ. (Japan)
Kunio Awazu, Osaka Univ. (Japan)


Published in SPIE Proceedings Vol. 6991:
Biophotonics: Photonic Solutions for Better Health Care
Jürgen Popp; Wolfgang Drexler; Valery V. Tuchin; Dennis L. Matthews, Editor(s)

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