[OPTICAL REVIEW Vol. 5, No. 2 (1998) 72-76]

Determination of the Asymmetry Parameter and Scattering Coefficient of Turbid Media from Spatially Resolved Reflectance Measurements

Matthew R. JONES1 and Yukio YAMADA2

1Department of Aerospace & Mechanical Engineering, University of Arizona, Tucson, Arizona 85721 USA, 2Biomechanics Division, Mechanical Engineering Laboratory, AIST-MITI, Namiki, 1-2, Tsukuba, Ibaraki, 305 Japan

(Received August 4, 1997; Accepted December 22, 1997)

We present a technique for determining the asymmetry parameter and scattering coefficient of turbid media from spatially resolved reflectance measurements. This technique will contribute to the development of medical applications in which it is necessary to predict the distribution and propagation of light in tissue. Based on Monte Carlo simulations, we derived correlations which relate the reduced scattering coefficient and the asymmetry parameter to the relative reflectance curve. Initial estimates of the optical properties are obtained from these correlations. Final values are obtained by adjusting the optical parameters and repeating the Monte Carlo simulations until the simulated reflectance pattern matches the measured reflectance pattern. Preliminary experimental results indicate that this technique can be used to determine the asymmetry parameter to within 10% and the reduced scattering coefficient to within 5%.

Key words : turbid media, optical properties, reflectance measurements, Monte Carlo