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 332 for “"Tomographic"”.
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Computed Tomographic Imaging Spectrometry
A Computed Tomographic Imaging Spectrometer (CTIS) is an imaging spectrometer which can acquire a hyper-spectral data set in a single snapshot (one focal plane array integration time) with no moving parts. A specially designed dispersing element, which separates light from the three-dimensional …
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Spatio-temporal tomographic imaging
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-02-04 without embargo terms
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Tomographic measurements of barotropic motions
… the barotropic tides from a basin scale tomographic array. Error analyses indicate an ability to estimate barotropic currents and surface displacements with errors less than 0.01 cm/s and 1 cm, respectively, over a large portion of the Northeast Pacific.
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Tactile tomographic imaging using robotic whiskers
… the rat’s whiskers, we introduce a new tactile tomographic imaging model using robotic metal whiskers to extract object features including size, shape and location, and map out the cross-sectional fluid-flow characteristics via tomographic imaging. Comparing the whisker position at the very …
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Tomographic reconstruction with adaptive sparsifying transforms
… which exploit the sparse representations of tomographic images have long been known to improve the quality of reconstructions from low-dose data. Recent work has shown the promise of adaptive, rather than fixed, sparse representations. In particular, the synthesis dictionary learning …
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Tomographic quantum cryptography with bell diagonal states
… part of the thesis, a generalized version of the Tomographic Quantum Key Distribution protocol in which the two users Alice and Bob share a Bell diagonal mixed state of two qubits will be presented and its security analyzed. In particular, it will be shown that if an eavesdropper performs a …
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Ultrasonic laboratory tests of geophysical tomographic reconstruction
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1986.
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Geometric estimation and reconstruction from tomographic data
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1993.
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A system safety analysis of tomographic treatment
… This thesis identifies the basic design of tomographic treatment and applies STPA to the TomoTherapy system. This tomographic treatment system treats hard-to-reach tumors and reduces radiation exposure to nearby healthy tissues. To ensure the quality of TomoTherapy, STPA is an effective …
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Development of Spect and Ct Tomographic Image Reconstruction
<p>The purpose of this study was to contribute to the advancement of statistically-based iterative reconstruction algorithms and protocols for both SPECT and micro CT data. Major contributions of this work to SPECT reconstruction include formulation and implementation of fully three-dimensional …
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Tomographic ventilation-perfusion lung scintigraphy in cardiopulmonary disease
… diagnose PE. The introduction of 3-dimensional tomographic lung scintigraphy (V/P SPECT) has resulted in an improved accuracy in the diagnosis of PE. Follow-up with V/P SPECT may lead to better individualization of PE treatment, but has not yet been evaluated. Changes in ventilation and …
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Coded Aperture Imaging: Digital Decoding and Tomographic Artifacts
Made available in DSpace on 2014-12-12T20:54:34Z (GMT). No. of bitstreams: 1 7709189.pdf: 4576715 bytes, checksum: a01295fbefe6961b97ab6b87b5d1330d (MD5) Previous issue date: 1976
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Air-coupled ultrasonic tomographic imaging of concrete elements
… PVC and concrete test samples. A customized tomographic reconstruction program is developed to provide full control over the imaging process including full and reduced spectrum tomographs with percent error and ray density calculations. Finite element models are also used to determine optimal …
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Tomographic PIV measurement of coherent dissipation scale structures
… flow between counter rotating impellers, using Tomographic Particle Image Velocimetry (TPIV). TPIV software was developed, with a novel approach permitting a significant reduction in processing time, and a series of numerical accuracy studies contributing to the fundamental understanding of this …
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Tomographic reconstruction of the morphology of silicon nanoparticleclusters
Semiconducting silicon nanoparticles and nanoparticle clusters are studied using conventional TEM, high resolution TEM and transmission electron tomography techniques. TEM and TEM based tomography provide the means to determine the size and morphology of primary particles and clusters, while the …
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Development of a motion-free tomographic imaging system
Computed tomography (CT) is the clinical standard for diagnosing many emergent medical conditions, such as stroke and traumatic brain injuries. Unfortunately, the size, weight, and expense of CT systems make them inaccessible for patients outside of large trauma centers. We have designed a module …
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Mechanical design of an ultrasonic tomographic imaging system
The paper presents the design and fabrication of a prototype for limb imaging aimed at tackling several of the issues. The design of the a US probe positioning system is intended to augment a system for motion measurement as well as a framework for the integration of motion and US data. The design …
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Wavefront Healing and Tomographic Resolution of Mantle Plumes
… in anti-correlation is also confirmed in tomographic inversions based on ray theory using Pdiff and Sdiff time delay measurements made on the SEM synthetics. This indicates a chemical origin of "superplumes" in the lowermost mantle may not be necessary to explain observed seismic …
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Generation of high resolution tomographic images for NDT applications
… it possible to use a number of straightforward tomographic reconstruction methods to produce high resolution images of flaws contained within the material under examination. A set of these images are then fused together using a novel fuzzy logic image fusion technique into a single image from …
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