Polarization-dependent backscattering patterns from weakly scattering media

Dogariu, Madi; Asakura, Toshimitsu

doi:10.1088/0150-536x/24/6/004

Cited by 42 publications

(14 citation statements)

References 20 publications

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“…This setup is known to be especially important when diagonally oriented four-leaf or fourfold cross-polarized patterns originate from a random distribution of surface and bulk nonhomogeneities of the sample, 17 or even from a weakly scattered uniform medium. 18 The presence of the quarter-wave plate also enabled measurement of the Stokes parameters of backscattered light, when necessary.…”

Section: Methodsmentioning

confidence: 99%

Intensity profiles of linearly polarized light backscattered from skin and tissue-like phantoms

et al. 2005

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Anisotropy of mouse and human skin is investigated in vivo using polarized videoreflectometry. An incident beam (linearly polarized, wavelength 650 nm) is focused at the sample surface. Two types of tissuelike media are used as controls to verify the technique: isotropic delrin and highly anisotropic demineralized bone with a priori knowledge of preferential orientation of collagen fibers. Equi-intensity profiles of light, backscattered from the sample, are fitted with ellipses that appear to follow the orientation of the collagen fibers. The ratio of the ellipse semiaxes is well correlated with the ratio of reduced scattering coefficients obtained from radial intensity distributions. Variation of equi-intensity profiles with distance from the incident beam is analyzed for different initial polarization states of the light and the relative orientation of polarization filters for incident and backscattered light. For the anisotropic media (demineralized bone and human and mouse skin), a qualitative difference between intensity distributions for cross- and co-polarized orientations of the polarization analyzer is observed up to a distance of 1.5 to 2.5 mm from the entry point. The polarized videoreflectometry of the skin may be a useful tool to assess skin fibrosis resulting from radiation treatment.

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Section: Methodsmentioning

confidence: 99%

Intensity profiles of linearly polarized light backscattered from skin and tissue-like phantoms

et al. 2005

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“…The sensitivity to scatterer size can be explained from the basic physics of light scattering. 19,20 There is a difference in scattering probabilities for intermediate angles ͑e.g., 90°͒ depending on whether scattering takes place in a plane perpendicular to the polarization vector-as is common for a photon traveling from the delivery fiber to fiber 1-or in planes parallel to the polarization vector-as is common for a photon traveling from the delivery fiber to fiber 4. When the scattering particles are small, 90°scattering events are less likely when the light is polarized parallel to the scattering plane, and consequently less light is collected by fiber than by fiber 1.…”

Section: B Measuring Scatterer Size and Concentrationmentioning

confidence: 99%

Characterizing mammalian cells and cell phantoms by polarized backscattering fiber-optic measurements

2001

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Fiber-optic, polarized elastic-scattering spectroscopy techniques are implemented and demonstrated as a method for determining both scatterer size and concentration in highly scattering media. Measurements of polystyrene spheres are presented to validate the technique. Measurements of biological cells provide an estimate of the average effective scatterer radius of 0.5-1.0 mum. This average effective scatterer size is significantly smaller than the nucleus. In addition, to facilitate use of polarization techniques on biological cells, polarized angular dependent scattering from cell suspensions was measured. The light scattering from cells has properties similar to those of small spheres.

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“…Here, we explain the experimental results shown in Fig. 5 with two relationships between the depolarization factor or contrast and the number of scattering events undergone by light before exiting from weakly scattering media [29,30]. Figure 8 shows two curves that illustrate these relationships.…”

Section: Discussionmentioning

confidence: 84%

“…It can be seen that the rotational symmetry is broken but the fold number is maintained. Dogariu [29] had reported that the incidence angle of the illuminating laser beam seemed not to influence substantially the features of the cross-pattern, except for an asymmetry of the pattern being more visible at low-volume fractions. In the present work, similar results were obtained.…”

Section: Discussionmentioning

confidence: 99%

Spatial pattern characterization of linear polarization-sensitive backscattering Mueller matrix elements of human serum albumin sphere suspension

et al. 2013

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Human serum albumin (HSA) nanometer or micron particles represent promising drug-carrier systems. The azimuthal and radial variations of a linear polarization-sensitive backscattering Mueller matrix were experimentally studied in two cases: the scattering particle was smaller or larger in size to the probing wavelength of 780 nm. The results show that the twofold and fourfold structures are characteristic of small particle size suspension, whereas the eightfold structure is characteristic of large particle size suspension. Moreover, for both particle size suspensions, the element patterns have strong radial dependence when the suspension concentration and the incident power of laser change. In addition, for both particle size suspensions, the rotational symmetry of each element is lost in the case of oblique incidence but the multifold structure is maintained. Some suggestions for applications of Mueller matrix imaging in biomedical optics are provided.

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Polarization-dependent backscattering patterns from weakly scattering media

Cited by 42 publications

References 20 publications

Intensity profiles of linearly polarized light backscattered from skin and tissue-like phantoms

Intensity profiles of linearly polarized light backscattered from skin and tissue-like phantoms

Characterizing mammalian cells and cell phantoms by polarized backscattering fiber-optic measurements

Spatial pattern characterization of linear polarization-sensitive backscattering Mueller matrix elements of human serum albumin sphere suspension

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