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Biomedical Optics Express

Biomedical Optics Express

  • Editor: Joseph A. Izatt
  • Vol. 1, Iss. 3 — Oct. 1, 2010
  • pp: 861–878

Implementation of the equation of radiative transfer on block-structured grids for modeling light propagation in tissue

Ludguier D. Montejo, Alexander D. Klose, and Andreas H. Hielscher  »View Author Affiliations


Biomedical Optics Express, Vol. 1, Issue 3, pp. 861-878 (2010)
http://dx.doi.org/10.1364/BOE.1.000861


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Abstract

We present the first algorithm for solving the equation of radiative transfer (ERT) in the frequency domain (FD) on three-dimensional block-structured Cartesian grids (BSG). This algorithm allows for accurate modeling of light propagation in media of arbitrary shape with air-tissue refractive index mismatch at the boundary at increased speed compared to currently available structured grid algorithms. To accurately model arbitrarily shaped geometries the algorithm generates BSGs that are finely discretized only near physical boundaries and therefore less dense than fine grids. We discretize the FD-ERT using a combination of the upwind-step method and the discrete ordinates (SN ) approximation. The source iteration technique is used to obtain the solution. We implement a first order interpolation scheme when traversing between coarse and fine grid regions. Effects of geometry and optical parameters on algorithm performance are evaluated using numerical phantoms (circular, cylindrical, and arbitrary shape) and varying the absorption and scattering coefficients, modulation frequency, and refractive index. The solution on a 3-level BSG is obtained up to 4.2 times faster than the solution on a single fine grid, with minimal increase in numerical error (less than 5%).

© 2010 OSA

OCIS Codes
(000.4430) General : Numerical approximation and analysis
(170.3660) Medical optics and biotechnology : Light propagation in tissues

ToC Category:
Optics of Tissue and Turbid Media

History
Original Manuscript: June 8, 2010
Revised Manuscript: September 12, 2010
Manuscript Accepted: September 13, 2010
Published: September 13, 2010

Virtual Issues
Optical Imaging and Spectroscopy (2010) Biomedical Optics Express

Citation
Ludguier D. Montejo, Alexander D. Klose, and Andreas H. Hielscher, "Implementation of the equation of radiative transfer on block-structured grids for modeling light propagation in tissue," Biomed. Opt. Express 1, 861-878 (2010)
http://www.opticsinfobase.org/boe/abstract.cfm?URI=boe-1-3-861


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