Chinese Optics Letters, 2009, 7 (6): 06515, Published Online: Jun. 8, 2009   

Hybrid diffusion approximation in highly absorbing media and its effects of source approximation

Author Affiliations
College of Science, Key Laboratory of Opto-Electronics Information Technical Science, Ministry of Education of China, Tianjin University, Tianjin 300072
Abstract
A modified diffusion approximation model called the hybrid diffusion approximation that can be used for highly absorbing media is investigated. The analytic solution of the hybrid diffusion approximation for reflectance in two-source approximation and steady-state case with extrapolated boundary is obtained. The effects of source approximation on the analytic solution are investigated, and it is validated that two-source approximation in highly absorbing media to describe the optical properties of biological tissue is necessary. Monte Carlo simulation of recovering optical parameters from reflectant data is done with the use of this model. The errors of recovering \mu_{a} and \mu_{s} are smaller than 15% for the reduced albedo between 0.77 and 0.5 with the source-detector separation of 0.4-3 mm.

Huijuan Tian, Ying Liu, Lijun Wang, Yuhui Zhang, Lifeng Xiao. Hybrid diffusion approximation in highly absorbing media and its effects of source approximation[J]. Chinese Optics Letters, 2009, 7(6): 06515.

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