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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 4 — Feb. 1, 2001
  • pp: 588–600

Three-Dimensional Simulation of Near-Infrared Diffusion in Tissue: Boundary Condition and Geometry Analysis for Finite-Element Image Reconstruction

Brian W. Pogue, Shireen Geimer, Troy O. McBride, Shudong Jiang, Ulf L. Österberg, and Keith D. Paulsen  »View Author Affiliations


Applied Optics, Vol. 40, Issue 4, pp. 588-600 (2001)
http://dx.doi.org/10.1364/AO.40.000588


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Abstract

Imaging of tissue with near-infrared spectral tomography is emerging as a practicable method to map hemoglobin concentrations within tissue. However, the accurate recovery of images by using modeling methods requires a good match between experiments and the model prediction of light transport in tissue. We illustrate the potential for a match between (i) three-dimensional (3-D) frequency-domain diffusion theory, (ii) two-dimensional diffusion theory, (iii) Monte Carlo simulations, and (iv) experimental data from tissue-simulating phantoms. Robin-type boundary conditions are imposed in the 3-D model, which can be implemented with a scalar coupling coefficient relating the flux through the surface to the diffuse fluence rate at the same location. A comparison of 3-D mesh geometries for breast imaging indicates that relative measurements are sufficiently similar when calculated on either cylindrical or female breast shapes, suggesting that accurate reconstruction may be achieved with the simpler cylindrical mesh. Simulation studies directly assess the effects from objects extending out of the image plane, with results suggesting that spherically shaped objects reconstruct at lower contrast when their diameters are less than 15–20 mm. The algorithm presented here illustrates that a 3-D forward diffusion model can be used with circular tomographic measurements to reconstruct two-dimensional images of the interior absorption coefficient.

© 2001 Optical Society of America

OCIS Codes
(110.6880) Imaging systems : Three-dimensional image acquisition
(110.7050) Imaging systems : Turbid media
(170.3010) Medical optics and biotechnology : Image reconstruction techniques
(170.3830) Medical optics and biotechnology : Mammography
(170.5270) Medical optics and biotechnology : Photon density waves
(170.5280) Medical optics and biotechnology : Photon migration

Citation
Brian W. Pogue, Shireen Geimer, Troy O. McBride, Shudong Jiang, Ulf L. Österberg, and Keith D. Paulsen, "Three-Dimensional Simulation of Near-Infrared Diffusion in Tissue: Boundary Condition and Geometry Analysis for Finite-Element Image Reconstruction," Appl. Opt. 40, 588-600 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-4-588

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