<title>Anisotropic absorption and reduced scattering spectra of chicken breast tissue measured using oblique incidence reflectometry</title>

Abstract

Oblique incidence reflectometry is a simple and accurate method for measuring the absorption and reduced scattering coefficients of turbid media. We used this technique to deduce absorption and reduced scattering spectra from wavelength-resolved measurements of the relative diffuse reflectance profile of white light as a function of source-detector distance. In this study we measured the absorption and reduced scattering coefficients of chicken breast tissue in the visible range (400 -800 nm) with the oblique incidence probe oriented at 0 and 90 degrees relative to the muscle fibers. We found that the deduced optical properties varied with the probe orientation. This experiment demonstrated the application of oblique-incidence, fiber-optic reflectometry to measurements on biological tissues and the effect of tissue structural anisotropy on optical properties.

Phase retrieval deblurring for imaging of dense object within a low scattering soft biological tissue

“…The method is not limited to a particular laser wavelength (532 nm was used in these experiments), and NIR source of illumination can be used to increase penetration depth 1,2,4,6,40,46 and reduced scattering, so a deeper image of bone location can be obtained.…”

“…Two fibula chicken bones (μ 0 s ∼ 40 cm −1 ) were placed between two layers of sliced chicken breast (μ 0 s ∼ 3.5 cm −1 ). 5,6 The thinner parts of the fibula bones (∼1 to 2 mm) were placed in the center of the sample, a few (0 to 10) mm apart, to test the ability of the suggested method to image bone shape and bone spacing with larger or similar dimensions.…”

“…Biological tissues, from an optical point of view, are described using absorption and scattering coefficients, which also depend on the illumination wavelengths. [1][2][3][4][5][6] Many attempts have been made to retrieve the shape of objects, which hide behind or within a medium that scatters light. [7][8][9][10] For strong scattering media such as the soft tissue, the incoming wavefront can only propagate a short distance of about a few millimeters without being significantly scattered.…”

Phase-function corrected diffusion model for diffuse reflectance of a pencil beam obliquely incident on a semi-infinite turbid medium

“…[1][2][3][4][5][6][7][8][9][10][11][12] Many of these techniques require or would benefit from accurate models of light transport near the point of entry. Computational models of light transport including Monte Carlo simulations [13][14][15][16] and numerical implementations of the radiative transport equation [17][18][19][20] are typically too computationally burdensome to be used for applications where rapid analysis is important.…”

“…In this paper, we extend their work to include a pencil beam obliquely incident on a semi-infinite turbid medium, and investigate the accuracy of the models by comparing them with Monte Carlo simulations. The case of oblique incidence is of noteworthy importance as a number of techniques rely on angled illumination, including oblique incidence reflectometry (OIR) and [1][2][3][4][5][6][29][30][31] angled low-coherence interferometry, [32][33][34][35][36][37][38] among others. 11 In this article, we focus on the applications of OIR, a technique that has seen great success in some clinical studies.…”