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Proceedings Paper

Near infrared laser penetration and absorption in human skin
Author(s): Babak Nasouri; Thomas E. Murphy; Halil Berberoglu
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Paper Abstract

For understanding the mechanisms of low level laser/light therapy (LLLT), accurate knowledge of light interaction with tissue is necessary. In this paper, we present a three dimensional, multi-layer Monte Carlo simulation tool for studying light penetration and absorption in human skin. The skin is modeled as a three-layer participating medium, namely epidermis, dermis, and subcutaneous, where its geometrical and optical properties are obtained from the literature. Both refraction and reflection are taken into account at the boundaries according to Snell’s law and Fresnel relations. A forward Monte Carlo method was implemented and validated for accurately simulating light penetration and absorption in absorbing and anisotropically scattering media. Local profiles of light penetration and volumetric absorption densities were simulated for uniform as well as Gaussian profile beams with different spreads at 155 mW average power over the spectral range from 1000 nm to 1900 nm. The results show the effects of beam profiles and wavelength on the local fluence within each skin layer. Particularly, the results identify different wavelength bands for targeted deposition of power in different skin layers. Finally, we show that light penetration scales well with the transport optical thickness of skin. We expect that this tool along with the results presented will aid researchers resolve issues related to dose and targeted delivery of energy in tissues for LLLT.

Paper Details

Date Published: 18 February 2014
PDF: 12 pages
Proc. SPIE 8932, Mechanisms for Low-Light Therapy IX, 893207 (18 February 2014); doi: 10.1117/12.2040337
Show Author Affiliations
Babak Nasouri, The Univ. of Texas at Austin (United States)
Thomas E. Murphy, The Univ. of Texas at Austin (United States)
Halil Berberoglu, The Univ. of Texas at Austin (United States)

Published in SPIE Proceedings Vol. 8932:
Mechanisms for Low-Light Therapy IX
Michael R. Hamblin; James D. Carroll; Praveen Arany, Editor(s)

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