Open AccessUse of the two-point-source -P1 approximation model for recovery of optical parameters in biological tissue
Author(s) -
Beibei Qi,
Ying Liu,
Jia Guang-Yi,
Xiaojun Liu
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.128701
Subject(s) - point source , radiative transfer , heavy traffic approximation , optics , attenuation coefficient , irradiance , physics , diffusion , reflection (computer programming) , scattering , diffusion equation , mean free path , diffuse reflection , absorption (acoustics) , computational physics , anisotropy , detector , statistics , thermodynamics , mathematics , computer science , economy , economics , programming language , service (business)
Based on a theoretical model for spatial diffusion reflection with two-point-source -P1 approximation to the radiative transport equation for a semi-infinite homogeneous turbid medium, the optical absorption coefficient a, reduced scattering coefficient ' s, and the second-order parameter of the medium are recovered from the measurement data of the reflectance by the nonlinear least squares method. The results show that the two-point-source -P1 approximation can give more satisfactory results for describing irradiance distribution close to source when the source-detector separation is larger than one transport mean free path. We can also obtain the anisotropy factor g according to the relationship between and ' s. This study is of great significance for the measurement of the optical properties of biological tissues and the application of diffuse reflectance spectroscopy technology.