Photon pathlength distribution from polarized backscattering in random media

Dogariu, Madi; Asakura, Toshimitsu

doi:10.1117/1.601016

Cited by 44 publications

(30 citation statements)

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“…12 In 1976, Bickel et al 13 advanced polarimetry into the field of biomedical sensing when they described a technique that measured the polarization effects of the scattered light from bacterial suspensions to yield useful information to characterize the sample. In the ensuing decades, several groups have shown that a considerable amount of information, such as the average particle size, 14 photon path length, 15 and particle shape 16 -18 can be obtained from polarization sensitive measurements of the sample under investigation. 19 In addition, others have shown that polarization-based imaging measurements can provide enhanced visualization of superficial structures 20 -22 to allow for subsurface imaging.…”

Section: Introductionmentioning

confidence: 99%

“…19 In addition, others have shown that polarization-based imaging measurements can provide enhanced visualization of superficial structures 20 -22 to allow for subsurface imaging. 23 The aforementioned applications of polarimetry for biomedical imaging involve the use of Mueller-Stokes calculus to mathematically depict how a biological sample affects the polarization vector of an incident light beam, determined by either backscattered 14,15,24,25 or transmitted 26 -28 light intensities from the sample. The experimental Mueller matrix of a sample contains information on retardance, diattenuation, and depolarization, which is not readily apparent in the original images.…”

Section: Introductionmentioning

confidence: 99%

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Use of polar decomposition for the diagnosis of oral precancer

et al. 2007

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The Mueller matrix describes all the polarizing properties of a sample and, therefore, the optical differences between noncancerous and precancerous tissue that may be present within the matrix elements. A high-speed polarimetry system that generates 16 ͑4 ϫ 4͒ full Mueller matrices to characterize tissues is presented. Feature extraction is done on the Mueller matrix elements resulting in depolarization and retardance images by polar decomposition. These are used to detect and classify early oral cancers and precancerous changes in epithelium such as dysplasia. These images are compared with orthogonal polarization images and analyzed in an attempt to identity useful factors for the differentiation between cancerous lesions and their benign counterparts. Our results indicate that polarimetry has potential as a method for the in vivo early detection and diagnosis of oral premalignancy.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Use of polar decomposition for the diagnosis of oral precancer

et al. 2007

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“…The investigated applications of this technique include the measurements of the average particle size, the scattering coefficients and the anisotropy factor of particle suspensions, 1 cloud diagnostics, 2,3 the study of biological materials, 4 -6 and the measurements of the average photon path length. 7 To achieve full experimental characterization of the optical properties of the sample under investigation, Hielscher et al 6,8 used a Stokes vector͞Mueller matrix approach to polarized light scattering. They generalized the concept of an effective Mueller matrix 9 and measured the two-dimensional Mueller matrix of backscattered light.…”

Section: Introductionmentioning

confidence: 99%

Light backscattering polarization patterns from turbid media: theory and experiment

et al. 1999

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We present both experimental measurements and Monte-Carlo-based simulations of the diffusely backscattered intensity patterns that arise from illuminating a turbid medium with a polarized laser beam. It is rigorously shown that, because of axial symmetry of the system, only seven elements of the effective backscattering Mueller matrix are independent. A new numerical method that allows simultaneous calculation of all 16 elements of the two-dimensional Mueller matrix is used. To validate our method we compared calculations to measurements from a turbid medium that consisted of polystyrene spheres of different sizes and concentrations in deionized water. The experimental and numerical results are in excellent agreement.

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“…In this paper we study a simple experiment, in which polarized light is backscattered from a diffuse medium. In these conditions, one observes between crossed polarizers a fourfold symmetry pattern which was first interpreted qualitatively by Dogariu and Asakura [1]. Recently more quantitative approaches have been developed for Mie scatterers using Mueller matrices [2].…”

Section: Pacs Numbersmentioning

confidence: 99%

Geometric depolarization in patterns formed by backscattered light

et al. 2004

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We formulate a framework for the depolarization of linearly polarized backscattered light based on the concept of geometric phase, i.e Berry's phase. The predictions of this theory are applied to the patterns formed by backscattered light between crossed or parallel polarizers. This theory should be particularly adapted to the situation in which polarized light is scattered many times but predominantly in the forward direction. We apply these ideas to the patterns which we obtained experimentally with backscattered polarized light from a colloidal suspension. PACS numbers:The transport of light through human tissues is one of the most promising technique to detect in a noninvasive way for instance breast cancer. For medical imaging applications, it is important to extract the information contained not only in the intensity but also in the polarization of backscattered light. This is not easy in general due to the complexity of vector-wave multiple scattering. In this paper we study a simple experiment, in which polarized light is backscattered from a diffuse medium. In these conditions, one observes between crossed polarizers a fourfold symmetry pattern which was first interpreted qualitatively by Dogariu and Asakura [1]. Recently more quantitative approaches have been developed for Mie scatterers using Mueller matrices [2]. A rather good agreement has been found between the experimental shapes of the patterns and the theoretically predicted ones [2,3,4].

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Photon pathlength distribution from polarized backscattering in random media

Cited by 44 publications

References 0 publications

Use of polar decomposition for the diagnosis of oral precancer

Use of polar decomposition for the diagnosis of oral precancer

Light backscattering polarization patterns from turbid media: theory and experiment

Geometric depolarization in patterns formed by backscattered light

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