Light dosimetry for focused and defocused beam irradiation in multi-layered tissue models

Kremena S. Petrova; Elena V. Stoykova

doi:10.1117/12.714170

12 September 2006 Light dosimetry for focused and defocused beam irradiation in multi-layered tissue models

Kremena S. Petrova, Elena V. Stoykova

Proceedings Volume 6284, International Conference on Lasers, Applications, and Technologies 2005: Laser Technologies for Environmental Monitoring and Ecological Applications, and Laser Technologies for Medicine; 62840I (2006) https://doi.org/10.1117/12.714170
Event: International Conference on Lasers, Applications, and Technologies 2005, 2005, St. Petersburg, Russian Federation

Abstract

Treatment of acupuncture points, trigger points, joint inflammations in low level laser therapy as well as various applications of lasers for treatment of soft tissues in dental medicine, require irradiation by a narrow converging laser beam. The aim of this study is to compare light delivery produced by focused or defocused narrow beam irradiation in a multi-layered skin tissue model at increasing depth of the target. The task is solved by 3-D Monte-Carlo simulation for matched and mismatched refractive indices at the tissue/ambient medium interface. The modeled light beams have a circular cross-section at the tissue entrance with uniform or Gaussian intensity distribution. Three are the tissue models used in simulation : i) a bloodless skin layer; ii) a bloodless skin layer with embedded scattering object; iii) a skin layer with small blood vessels of varying size, which are modeled as infinite cylinders parallel to the tissue surface located at different depths. Optical properties (absorption coefficient, scattering coefficient, anisotropy factor, g, and index of refraction) of different tissue constituents are chosen from the literature.

Citation Download Citation

Kremena S. Petrova and Elena V. Stoykova "Light dosimetry for focused and defocused beam irradiation in multi-layered tissue models", Proc. SPIE 6284, International Conference on Lasers, Applications, and Technologies 2005: Laser Technologies for Environmental Monitoring and Ecological Applications, and Laser Technologies for Medicine, 62840I (12 September 2006); https://doi.org/10.1117/12.714170

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KEYWORDS

Tissue optics

Laser therapeutics

Skin

Refractive index

Tissues

Natural surfaces

Absorption

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