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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 18, Iss. 3 — Mar. 1, 2001
  • pp: 584–599

Steady-state reflectance spectroscopy in the P3 approximation

Edward L. Hull and Thomas H. Foster  »View Author Affiliations


JOSA A, Vol. 18, Issue 3, pp. 584-599 (2001)
http://dx.doi.org/10.1364/JOSAA.18.000584


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Abstract

The Green’s function of the steady-state radiative-transport equation is derived in the P<sub>3</sub> approximation for isotropic sources. It is demonstrated that the P<sub>3</sub> approximation models the radiance in highly absorbing media or close to sources more accurately than does diffusion theory. Boundary conditions consistent with the P<sub>3</sub> approximation are also developed for semi-infinite media bounded by a nonscattering medium. Expressions for the reflectance remitted from media interrogated by a normally incident pencil beam are derived and fitted to simulated and experimental reflectance data from media having optical properties typical of biological tissue. The reconstructed optical properties are accurate to within ±10% in absorption and scattering for source–detector separations as small as 0.43 mm and albedos as low as 0.59. Methods for simplifying these expressions given some <i>a priori</i> knowledge of the scattering phase function are discussed.

© 2001 Optical Society of America

OCIS Codes
(030.5620) Coherence and statistical optics : Radiative transfer
(170.1470) Medical optics and biotechnology : Blood or tissue constituent monitoring
(170.6510) Medical optics and biotechnology : Spectroscopy, tissue diagnostics
(170.7050) Medical optics and biotechnology : Turbid media

Citation
Edward L. Hull and Thomas H. Foster, "Steady-state reflectance spectroscopy in the P3 approximation," J. Opt. Soc. Am. A 18, 584-599 (2001)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-18-3-584


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