P₃ approximation of Boltzmann transport equation describes the radiance close to source with accuracy superior to diffuse approximation, which considers the high-order moments of phase function. Here, through studying the influence of two different phase functions on P₃ approximation, we find that the difference of diffuse reflectance in the P₃ approximation is distinct in about 0.45mm close to source for tissue phase function and Henyey-Greenstein (HG) phase function; tissue phase function can more character the microstructure of biological tissue than HG phase function. The research shows light for improving the accuracy of describing the radiance close to source, and of determining the optical properties of small volume tissue.

Date Published: 8 December 2003
PDF: 6 pages
Proc. SPIE 5254, Third International Conference on Photonics and Imaging in Biology and Medicine, (8 December 2003); doi: 10.1117/12.546218

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)