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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 51, Iss. 12 — Apr. 20, 2012
  • pp: 2192–2201

Phase-function normalization for accurate analysis of ultrafast collimated radiative transfer

Brian Hunter and Zhixiong Guo  »View Author Affiliations


Applied Optics, Vol. 51, Issue 12, pp. 2192-2201 (2012)
http://dx.doi.org/10.1364/AO.51.002192


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Abstract

The scattering of radiation from collimated irradiation is accurately treated via normalization of phase function. This approach is applicable to any numerical method with directional discretization. In this study it is applied to the transient discrete-ordinates method for ultrafast collimated radiative transfer analysis in turbid media. A technique recently developed by the authors, which conserves a phase-function asymmetry factor as well as scattered energy for the Henyey–Greenstein phase function in steady-state diffuse radiative transfer analysis, is applied to the general Legendre scattering phase function in ultrafast collimated radiative transfer. Heat flux profiles in a model tissue cylinder are generated for various phase functions and compared to those generated when normalization of the collimated phase function is neglected. Energy deposition in the medium is also investigated. Lack of conservation of scattered energy and the asymmetry factor for the collimated scattering phase function causes overpredictions in both heat flux and energy deposition for highly anisotropic scattering media. In addition, a discussion is presented to clarify the time-dependent formulation of divergence of radiative heat flux.

© 2012 Optical Society of America

OCIS Codes
(000.4430) General : Numerical approximation and analysis
(030.5620) Coherence and statistical optics : Radiative transfer
(170.3660) Medical optics and biotechnology : Light propagation in tissues
(290.7050) Scattering : Turbid media

ToC Category:
Coherence and Statistical Optics

History
Original Manuscript: October 12, 2011
Revised Manuscript: February 10, 2012
Manuscript Accepted: February 20, 2012
Published: April 20, 2012

Virtual Issues
Vol. 7, Iss. 6 Virtual Journal for Biomedical Optics

Citation
Brian Hunter and Zhixiong Guo, "Phase-function normalization for accurate analysis of ultrafast collimated radiative transfer," Appl. Opt. 51, 2192-2201 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-12-2192


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