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Proceedings Paper

Diffusion approximation based convolution method for spatial resolved reflectance of biological tissues irradiated by photon beams with finite diameter
Author(s): Zhenhua Li; Jiancheng Lai; Chunyong Wang; Anzhi He
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Paper Abstract

In this paper, a mathematical expression of reflectance point-spread-function, that is defined as the spatial distribution of light diffuse-reflected from biological tissues irradiated by pencil light, is derived from the diffusion approximation (DA) theory. Through calculating partial derivative of the reflectance point-spread function with respect to effective scattering coefficient, we proposed a quantitative criterion for the applicability of diffuse approximation. Moreover, by the introduction of the reflectance point-spread-function, we can use convolution method to calculate the spatial resolved reflectance from dense and thick tissues irradiated by photon beams with finite diameter. We called this method DA based convolution method. Numerical calculations show that the DA based convolution method has much higher computing efficiency compared with the Monte Carlo method.

Paper Details

Date Published: 8 December 2003
PDF: 9 pages
Proc. SPIE 5254, Third International Conference on Photonics and Imaging in Biology and Medicine, (8 December 2003); doi: 10.1117/12.546425
Show Author Affiliations
Zhenhua Li, Nanjing Univ. of Science and Technology (China)
Jiancheng Lai, Nanjing Univ. of Science and Technology (China)
Chunyong Wang, Nanjing Univ. of Science and Technology (China)
Anzhi He, Nanjing Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 5254:
Third International Conference on Photonics and Imaging in Biology and Medicine
Qingming Luo; Valery V. Tuchin; Min Gu; Lihong V. Wang, Editor(s)

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