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Use of the two-point-source -P1 approximation model for recovery of optical parameters in biological tissue

Qi Bei-Bei Liu Ying Jia Guang-Yi Liu Xiao-Jun

Use of the two-point-source -P1 approximation model for recovery of optical parameters in biological tissue

Qi Bei-Bei, Liu Ying, Jia Guang-Yi, Liu Xiao-Jun
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  • Received Date:  02 March 2011
  • Accepted Date:  26 July 2011
  • Published Online:  15 December 2011

Use of the two-point-source -P1 approximation model for recovery of optical parameters in biological tissue

  • 1. College of Science, Tianjin University, Tianjin 300072, China;
  • 2. Key Laboratory of Opto-electronic Information Science and Technology of Ministry of Education, College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China

Abstract: 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.

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