Information Technology Journal1812-56381812-5646Asian Network for Scientific Information10.3923/itj.2014.1281.1284ZhangXiaojuan LiYan LiWenqing YangWei 62014136The diffusion approximation solution with one-point-source and two-point-source are investigated. In this theoretical model, considering a pencil beam incident on a semi-infinity scattering medium, the source function is simplified as one-point-source satisfying the dipole moment and two-point-source satisfying both the dipole and the quadrupole moments. The spatially resolved diffuse reflectance for the simplified sources are studied, which indicate that two-point-source approximation can more describe radiance close to the source and more depict the anisotropy radiance superior to one-point-source approximation.]]>Ishimaru, A.,1986Tuchin, V.V.,2000Pages: 352Pages: 352Kienle, A., M.S. Patterson,199714246254Thueler, P., I. Charvet, F. Bevilacqua, M. St. Ghislain and G. Ory et al.,2003In vivo endoscopic tissue diagnostics based on spectroscopic absorption, scattering and phase function properties.]]>8495503Bevilacqua, F., D. Piguet, P. Marquet, J.D. Gross, B.J. Tromberg and C. Depeursinge,1999In vivo local determination of tissue optical properties: Applications to human brain.]]>3849394950Hull, E.L. and T.H. Foster,20013 approximation.]]>18584599Kienle, A., F.K. Forster and R. Hibst,20012615711573Venugopalan, V., J.S. You and B.J. Tromberg,19985823952407Farrell, T.J., M.S. Patterson and B.C. Wilson,1992in vivo.]]>19879888