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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 13 — May. 1, 2000
  • pp: 2235–2244

Monte Carlo diffusion hybrid model for photon migration in a two-layer turbid medium in the frequency domain

George Alexandrakis, Thomas J. Farrell, and Michael S. Patterson  »View Author Affiliations


Applied Optics, Vol. 39, Issue 13, pp. 2235-2244 (2000)
http://dx.doi.org/10.1364/AO.39.002235


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Abstract

We propose a hybrid Monte Carlo (MC) diffusion model for calculating the spatially resolved reflectance amplitude and phase delay resulting from an intensity-modulated pencil beam vertically incident on a two-layer turbid medium. The model combines the accuracy of MC at radial distances near the incident beam with the computational efficiency afforded by a diffusion calculation at further distances. This results in a single forward calculation several hundred times faster than pure MC, depending primarily on model parameters. Model predictions are compared with MC data for two cases that span the extremes of physiologically relevant optical properties: skin overlying fat and skin overlying muscle, both in the presence of an exogenous absorber. It is shown that good agreement can be achieved for radial distances from 0.5 to 20 mm in both cases. However, in the skin-on-muscle case the choice of model parameters and the definition of the diffusion coefficient can lead to some interesting discrepancies.

© 2000 Optical Society of America

OCIS Codes
(170.5280) Medical optics and biotechnology : Photon migration
(290.1990) Scattering : Diffusion

History
Original Manuscript: September 16, 1999
Revised Manuscript: January 21, 2000
Published: May 1, 2000

Citation
George Alexandrakis, Thomas J. Farrell, and Michael S. Patterson, "Monte Carlo diffusion hybrid model for photon migration in a two-layer turbid medium in the frequency domain," Appl. Opt. 39, 2235-2244 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-13-2235

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