Residual polarization of non-coherently backscattered linearly polarized light: the influence of the anisotropy parameter of the scattering medium

Turbid medium polarimetry in biomedical imaging and diagnosis

“…Similar expressions for residual degree of polarization of back-scattered (a geometry that is convenient for many practical applications) light have also been obtained by others [5,36]. For example, Zymniakov et al used path integral approach to derive expression for residual degree of polarization (P L ) of linearly polarized light back-scattered from turbid medium [36]. In this approach, the single path degree of polarization [P L (s), s = nl, the pathlength] was averaged over the ensemble of partial components of the scattered optical fields characterized by the pathlength density distribution function [ρ(s)], to yield the following expression for P L of back-scattered light:…”

“…In fact, Bicout et al [11] derived a closed form analytical expression for surviving degree of polarization of light transmitting through a slab of scattering medium by incorporating the diffusion theory-based expression for ρ(n) in equation (21). Similar expressions for residual degree of polarization of back-scattered (a geometry that is convenient for many practical applications) light have also been obtained by others [5,36]. For example, Zymniakov et al used path integral approach to derive expression for residual degree of polarization (P L ) of linearly polarized light back-scattered from turbid medium [36].…”

“…Using Monte Carlo simulation of polarized light transport and by carrying out experimental studies on scattering samples prepared using monodisperse spherical scatterers, they investigated the possibility of utilizing degree of polarization to discriminate against multiply scattered light. Motivated by the encouraging results of this pioneering study, several theoretical [11][12][13][14][15]35,36] and experimental investigations [18][19][20][21][22]47,48] have been carried out to develop optimal polarization scheme for imaging through tissue. We shall summarize these with representative results.…”

Peculiarities of diffuse reflectance of polarized light from anisotropic media: simulation results

“…These differences in pathlength statistics should obviously cause the specific behavior of spatial distributions of polarization parameters of backscaffered light (in particular, the degree of linear polarization), which was discussed in Ref. 4. Thus, in the case of spatially resolved diffuse reflectance spectroscopy of macroscopically anisotropic multiple scattering media, which is provided with the use of localized source of polarized probe light, the following approaches can be considered for specification ofthe probed medium by its optical parameters: -evaluation of the radius of "isotropic" equal intensity profile and the similar parameters for the spatial distributions of the polarization parameters of backscattered light; -evaluation of the eccentricity of the equal intensity ellipses in the near zone (close to the light source) and in the far zone; the similar technique can be applied for polarization parameters; -evaluation of the slope of radial dependencies of the backscattered intensity (and, correspondingly, the polarization parameters such as, e.g., the degree ofresidual linear polarization) in semi-logarithmic coordinates.…”

Theoretical model for assessing multiple scattering and coherence gating on polarized sensitive images

“…[19][20][21] The multiple scattering is widely studied by a Monte Carlo (MC) technique. [22][23][24][25][26][27][28] MC technique can provide detailed information in polarization propagation within/outside a scattering medium and can score various physical quantities simultaneously. In this study we combine the MC method and the Bethe-Salpeter equation (BSE), represented as the series of ladder diagrams, to give a general modeling approach for coherent backscattering and TCFs calculations.…”