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Proceedings Article

Monte Carlo simulations of the growth and decay of quasi-ballistic photon fractions with depth in an isotropic scattering medium

[+] Author Affiliations
Nick Pfeiffer, Glenn H. Chapman

Simon Fraser Univ. (Canada)

Proc. SPIE 5695, Optical Interactions with Tissue and Cells XVI, 136 (April 20, 2005); doi:10.1117/12.590512
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From Conference Volume 5695

  • Optical Interactions with Tissue and Cells XVI
  • Steven L. Jacques; William P. Roach
  • San Jose, CA | January 22, 2005

abstract

Quasi-ballistic or "snake" photons carry useable information on the internal structure of scattering mediums such as tissues. By defining quasi-ballistic photons to be those photons that have been scattered but have not exceeded a specified radial distance threshold from their initial trajectory (equivalent to the resolving limit of the quasi-ballistic photons) and by using the Henyey-Greenstein phase function, Monte Carlo modeling has shown that the number of quasi-ballistic photons increases with depth in an isotropic scattering medium until a maximum is reached and then the quantity decreases. The quantity of quasi-ballistic photons at a specified depth can be shown to be governed by two competing processes: the decay of ballistic photons into quasi-ballistic photons and the decay of quasi-ballistic photons into scattered photons. These well-defined behaviors allow one to write a rate equation governing the growth and decay in the quantity of quasi-ballistic photons with depth. It is found that as the anisotropy factor increases with forward scattering and as the resolution limit is widened, the quantity of quasi-ballistic photons begins to exceed the quantity of ballistic photons at a specified depth and the rate of decay of quasi-ballistic photon quantity decreases. The development of a rate equation for the formation of quasi-ballistic photons allows one to analyze how efficient various detection methods are in extracting these quasi-ballistic photons, and it can be seen that there is a compromise between desired resolution and the effective scattering ratio at a detector.

© (2005) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Nick Pfeiffer and Glenn H. Chapman
"Monte Carlo simulations of the growth and decay of quasi-ballistic photon fractions with depth in an isotropic scattering medium", Proc. SPIE 5695, Optical Interactions with Tissue and Cells XVI, 136 (April 20, 2005); doi:10.1117/12.590512; http://dx.doi.org/10.1117/12.590512


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