Determination of the optical parameters of tissues is a necessary element of laser medical diagnostics and therapy planning. In this work a mathematical model of the photon migration in tissues is considered in the as...
详细信息
ISBN:
(纸本)0819413496
Determination of the optical parameters of tissues is a necessary element of laser medical diagnostics and therapy planning. In this work a mathematical model of the photon migration in tissues is considered in the assumption of the harmonic modulation of the incident laser light. The scattering coefficient and the photon's life time in virtually absorbed state can be calculated from the modulation coefficient and phase shift between incident and scattered light. Frequency-domain measurements were performed using two laser diodes (wavelengths 805 and 850 nm) as light- modulated sources and fiber-optic light guides for delivering the light to tissues surface and collecting the back scattering output. It is shown that measured difference in phase shift of scattered light intensity is proportional to difference in mean pathlength of photons at two wavelengths.
Particle orientation in a disperse medium results both in anisotropic properties and in the changes in spectral transmittancy. To determine theoretically the effects of such kind a general approach based on the joint ...
详细信息
ISBN:
(纸本)0819413496
Particle orientation in a disperse medium results both in anisotropic properties and in the changes in spectral transmittancy. To determine theoretically the effects of such kind a general approach based on the joint use of both the equation of Brownian rotation diffusion and the Mueller matrix for a thin slab of anisotropic medium has been developed. The optical properties of scatterers are described in terms of the first and second Born approximation and the exact T-matrix method. The goal of the investigations is to develop adequate optical models for interpretation of the experimental data obtained for the ordered disperse systems. In this paper, anisotropic properties of oriented disperse systems are discussed in a review manner, while the orientational turbidimetric effect is considered in detail.
暂无评论