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Proceedings Paper

Hybrid model for photon propagation in random media based on the radiative transfer and diffusion equations
Author(s): H. Fujii; Y. Hoshi; S. Okawa; T. Kosuge; S. Kohno
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Paper Abstract

For improvement of diffuse optical tomography, one needs a numerical model to compute photon propagation accurately and efficiently. Thus, in the paper, we construct a hybrid model based on the radiative transfer equation (RTE) and diffusion equation (DE) in the time domain under the refractive-index-mismatching at boundary. At first, a fictive interface between the RTE and DE regions is determined, which is characterized by a length scale ρDA. By comparing the fluence rate calculated based on the RTE to that on the DE, we estimate ρDA at ~10/μt, where μt denotes the extinction coefficient. Next, we determine a coefficient representing the reflectivity in the Robin boundary condition of the DE by analyzing the fluence rates in the domain outside ρDA. Then, the hybrid model is constructed by using the determinations. The fluence rates based on this hybrid algorithm is consistent with those on the RTE in a whole range of the medium and computational costs are reduced efficiently.

Paper Details

Date Published: 25 March 2013
PDF: 7 pages
Proc. SPIE 8578, Optical Tomography and Spectroscopy of Tissue X, 857835 (25 March 2013); doi: 10.1117/12.2019914
Show Author Affiliations
H. Fujii, The Tokyo Metropolitan Institute of Medical Science (Japan)
Y. Hoshi, The Tokyo Metropolitan Institute of Medical Science (Japan)
S. Okawa, National Defense Medical College (Japan)
T. Kosuge, The Univ. of Electro-Communications (Japan)
S. Kohno, The Tokyo Metropolitan Institute of Medical Science (Japan)


Published in SPIE Proceedings Vol. 8578:
Optical Tomography and Spectroscopy of Tissue X
Bruce J. Tromberg; Arjun G. Yodh; Eva Marie Sevick-Muraca, Editor(s)

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