Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"Turbid media"”.
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Microscopic imaging in turbid media
… the understanding of photon propagation within turbid media with different characteristics (e.g. scattering anisotropy, optical thickness and geometric thickness). The turbid media (samples) used in the work presented in this thesis consist of polystyrene microspheres and semi-skimmed milk …
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Multiple Light Scattering from Isotropic and Anosotropic Turbid Media
The Brownian motion of particles in a fluid is a problem with spectacular historical roots [1, 2] and continues to provide us with intriguing new physics. Recently there has been resurging interest in the first steps of these motions [3, 4, 5, 6, 7, 8]. This is largely a result of new experimental …
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Fluorescence correlation spectroscopy: ultrasensitive detection in clear and turbid media
… bacteria, viruses, and protein aggregates in turbid fluids for clinical and biotechnological applications. The anticipated applications of this technique are many. They range from the determination of the somatic cell count in milk for the dairy industry, to the enumeration and …
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Interferometric photomechanical spectroscopy and imaging of biological and turbid media
The medical field is currently experiencing rapid growth in the area of optical diagnostics. Minimally-invasive spectroscopic and imaging modalities enable physicians to make increasingly accurate diagnoses in real time, without the cost and delay associated with traditional reliance on …
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Oblique-incidence fiber-optic reflectometry for measuring absorption and scattering in turbid media
… and $\mu\sb{s}\sp\prime ,$ of semi-infinite turbid media. Obliquely incident light produces a spatial distribution of diffuse reflectance that is not centered about the point of light entry. The shift in the center of diffuse reflectance is related to the medium's diffusion coefficient, D. We …
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Photon migration in turbid media : time-resolved optical imaging in tissue-like phantom
Thesis (Ph. D.)--Massachusetts Institute of Technology, Whitaker College of Health Sciences and Technology, 1996.
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Optical Scanning Holography for 3-D Imaging of Fluorescent Objects in Turbid Media
… for 3-D imaging of fluorescent objects in turbid media is described and experimentally demonstrated. For the first time, 3-D imaging of fluorescentobjects in turbid media by a holographic method is achieved, and the diffused photon rejecting process through a heterodyne technique is …
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Image and Optical Property Reconstruction From Noninvasive Measurements of Turbid Media, in Vitro and in Vivo: A Promising Method for Optical Mammography
… of objects immersed in highly scattering media. In this thesis I describe a model for locating and characterizing optical inhomogeneities in a turbid medium. I will go on to discuss limits of the technique and present data collected in vivo from a 55 year old female subject with a …
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In vitro and in vivo image and optical property reconstruction from noninvasive measurements of turbid media: A promising method for optical mammography
Restriction data tranferred 2014-07-01T11:34:31-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: thesis
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Spatial Localization and Temporal Analysis of Optical Property Fluctuations by Multiplexed Near -Infrared Photon Density Waves in Turbid Media: In Vitro and in Vivo Studies
Recently much attention has been given to the study of the processes in the human brain that lead to the changing of the optical parameters that characterize the tissue, measured by our frequency-domain instrumentation. These processes have been divided into two main categories with different …
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Spatial localization and temporal analysis of optical property fluctuations by multiplexed near-infrared photon density waves in turbid media: In vitro and in vivo studies
In recent years the application of near infrared non-invasive methods for medical diagnostics and clinical studies has grown rapidly. The ease of use, low cost and portability of these methods is a clear advantage over other techniques such as MRI. The limitations in detection of optical property …
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Probing Random Media With Singular Waves
… the light propagation in highly inhomogeneous media and the relationship to angular momentum transfer. Angular momentum carried by light can be, in many cases, divided in two terms. The first one relates to the polarization of light and can be associated, in the quantum description, to the spin …
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Gradient light interference microscopy for imaging strongly scattering samples
… optical field to scramble when interacting with turbid media, leading to contrast images. In this work, we outline the development of an instrument that uses broadband optical fields in conjunction with phase-shifting interferometry to extract high-resolution and high-contrast structures from …
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Development of a Non-Contact Fluorescence Tomography System with Appropriate Reconstruction Techniques
… images cannot be compared. Fluorescence mediated tomography (FMT) as presented herein is hoped to overcome these shortcomings by providing a quantitative means of estimating fluorochrome concentrations in vivo. Usually, FMT-systems rely on detector readings obtained through light guiding …
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Monitoring Bacteria Cultures Using Near Infrared (nir) Binary Spectronephelometry (bsn), Raman Spectra and Principal Component Analysis (pca)
… monitor the concentrations of cells and media components that define the state of native bacterial cultures, because of changing turbidity. A new technique, binary spectronephelometry (BSN) has the same or better sensitivity and precision for population monitoring as optical density at …
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Bioinspired scattering materials: light transport in anisotropic, disordered systems
The study of light propagation in disordered media has attracted the interest of many researchers for its relevance to fundamental and applied problems, ranging from imaging through turbid media to the fabrication of white paint. Scattering in a disordered system is determined by the spatial …
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Optical Imaging Of Tissue Physiology With Exogenous Contrast Agents
… methodology for imaging fluorescent targets in turbid media such as tissue. This approach used the ideas of spatial frequency domain fluorescence diffuse optical tomography (SFD-FDOT). The new reconstruction algorithm modified the more complex SFD-FDOT reconstruction method to rapidly acquire …
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Three dimensional simulation of functional neuro-vascular imaging
… simulating light propagation in large volumes of turbid media. For this reason, three dimensional Monte Carlo simulations of light propagation combined with high resolution vascular anatomy were used to directly simulate FLIM and LSCI in the brain. Using these simulations, the imaging depth, …
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