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 2177 for “"Tomography"”.
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Origami tomography
This thesis analyzes two dimensional tomographic imaging of surface objects with negligible volume, concentrating on piecewise linear surfaces similar to folded origami. In contrast to the large number of projections usually necessary in traditional tomographic imaging, information is extracted …
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Limited angle tomography
This thesis investigates the limited angle tomography problem where axial reconstructions are produced from few measured projection views covering a 100° angular range. Conventional full angle tomography requires at least a 180° range of projection views of the patient at a fine angular spacing. …
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Optical coherence tomography
Thesis (Ph. D.)--Massachusetts Institute of Technology, Whitaker College of Health Sciences and Technology, 1993.
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Seismic borehole tomography
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1988.
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Nonlinear traveltime tomography
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1993.
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Cramér-Rao bounds for matched field tomography and ocean acoustic tomography
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Fast Algorithms for Tomography
This thesis presents and analyzes several novel algorithms and techniques for processing tomographic data that are significantly faster and more accurate than existing fast methods. First, a new fast reconstruction algorithm based on a hierarchical decomposition of the back-projection operation is …
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Electron tomography of defects
Tomography of crystal defects in the electron microscope was rst attempted in 2005 by the author and colleagues. This thesis further develops the technique, using a variety of samples and methods. Use of a more optimised, commercial tomographic reconstruction program on the original GaN weakbeam …
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Toward electric field tomography
Thesis (M.S.)--Massachusetts Institute of Technology, Program in Media Arts & Sciences, 1995.
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Novel contrasts in photoacoustic tomography
<p>Photoacoustic tomography (PAT) combines rich optical contrast and high ultrasonic resolution in optically scattering tissue at depths. Taking advantage of its 100% sensitivity to optical absorption, PAT has been widely applied to structural, functional and molecular imaging, with both endogenous …
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Applications of neutron radiography & tomography
… underlying physics of neutron radiography and tomography mean that it has fundamental similarities to x-ray techniques, although some subtle differences mean that neutrons are often applicable in circumstances where x-rays are not. This complementarity is presented and discussed. Most of the …
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Ionospheric imaging using computerized tomography
Computerized tomography (CT) techniques can be used to produce a two-dimensional image of the electron density in the ionosphere. The necessary data are transionospheric satellite beacon total electron content (TEC) data recorded simultaneously at multiple ground stations.
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Teleseismic transmission and reflection tomography
The aim of seismic tomography is to determine a model of Earth properties that best explain observed seismic data. In practice, the limitations placed on our observations and computational capabilities force us to make a number of decisions about the scales and parameterizations of models, the …
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Isogeometric Approach to Optical Tomography
Optical Tomography is an imaging modality that enhances early diagnosis of disease through use of harmless Near-Infrared rays instead of conventional x-rays. The subsequent images are used to reconstruct the object. However Optical Tomography has not been effectively utilized due to the complicated …
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Analytical Modeling of Optical Coherence Tomography
Optical Coherence Tomography (OCT) has become an indispensable imaging modality in ophthalmology and dermatology, prized for its micrometer-level resolution, non-invasiveness, and significant penetration depth. Despite its precision in revealing skin morphology, standard OCT lacks the ability to …
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Quantification and Reconstruction in Photoacoustic Tomography
… data acquisition speed in photoacoustic computed tomography: PACT) is limited by the laser repetition rate and the number of parallel ultrasound detecting channels. Reconstructing an image with fewer measurements can effectively accelerate the data acquisition and reduce the system cost. We …
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