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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 28, Iss. 12 — Jun. 15, 1989
  • pp: 2250–2255

Accuracies of the diffusion approximation and its similarity relations for laser irradiated biological media

Gilwon Yoon, Scott A. Prahl, and Ashley J. Welch  »View Author Affiliations


Applied Optics, Vol. 28, Issue 12, pp. 2250-2255 (1989)
http://dx.doi.org/10.1364/AO.28.002250


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Abstract

The accuracy of the diffusion approximation is compared with more accurate solutions for describing light interaction with biological tissues. Generally the diffusion approximation underestimates the light distribution in the surface region, and, for high albedos, it significantly underestimates the fluence rate. This difference is only a few percent for albedos of less than 0.5 due to the dominance of collimated light. As the anisotropy of scattering increases, deviations increase. In general, fluxes can be computed more accurately with the diffusion approximation than fluence rates. For anisotropic scattering, better results can be obtained by simple transforms of optical coefficients using the similarity relations. The similarity relations improve flux calculations, but computed fluence rates have substantial errors for high albedo and the large index of refraction differences at the surface.

© 1989 Optical Society of America

History
Original Manuscript: November 28, 1988
Published: June 15, 1989

Citation
Gilwon Yoon, Scott A. Prahl, and Ashley J. Welch, "Accuracies of the diffusion approximation and its similarity relations for laser irradiated biological media," Appl. Opt. 28, 2250-2255 (1989)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-28-12-2250

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