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 22 for “"Algebraic Reconstruction"”.
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Algebraic Reconstruction Methods for Complex Geometry Components
… cabinet systems are capable of acquisition and reconstruction of Cone Beam CT (CBCT) data utilising reconstruction algorithms such as the FDK, which are mathematically based on traditional FBP. While these algorithms are computationally efficient, limitations in the acquisition make inspection …
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An algebraic reconstruction technique (ART) for the synthesis of three-dimensional models of particle aggregates from projective representations
… attempts to address this problem by adapting the algebraic reconstruction technique (ART) to synthesize composite 3-D granular particles from statistically obtained 3-D shape descriptors of the particles in an aggregate mixture. This thesis extends previous work where it was demonstrated that the …
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Application and Development of Algebraic Reconstruction Algorithms for High Dose Rate Brachytherapy Gel Dosimetry with Optical Computed Tomography Readout
… using the standard Feldkamp-Davis-Kress (FDK) reconstruction algorithm. This work then investigated using the Ordered Subsets Convex algorithm with Total Variation minimization regularization (OSC-TV) instead of the FDK algorithm to suppress the artifacts. Three variants of the OSC-TV algorithm …
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The Study of Binary Steering Algorithms in Discrete Tomography
… technique in iterative methods for image reconstruction in discrete tomography (DT). We will compare the effectiveness of three common algorithms to solve binary systems. The methods used are the Algebraic Reconstruction Technique (ART), Cimmino (CIM), and Diagonally-Relaxed Orthogonal …
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The Reconstruction of Binary Images in Discrete Tomography by Using the Binary Steering Scheme
<p>We propose and study the reconstruction of large binary images in discrete tomography (DT) by applying the binary steering scheme to the block-iterative projections methods for solving an underdetermined linear system Ax = b. Three algorithms: Algebraic Reconstruction Technique (ART) Algorithm, …
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Development and Validation of Reconstruction Algorithms for 3D Tomography Diagnostics
This work reports three reconstruction algorithms developed to address the practical issues encountered in 3D tomography diagnostics, such as the limited view angles available in many practical applications, the large scale and nonlinearity of the problems when they are in 3D, and the measurement …
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Algorithms for Tomographic Reconstruction of Rectangular Temperature Distributions using Orthogonal Acoustic Rays
… (3.25 by 10 inches) was used for validation and reconstruction. 0.3 % static temperature relative error compared with thermocouple-measured data was achieved using a cross-correlation algorithm to calculate speed of sound. Tomographic reconstruction algorithms, the simplified multiplicative …
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A survey of algebraic algorithms in computerized tomography
… in building a sequence of two-dimensional reconstructions of the interior structure. This thesis comprises a review of the different types of algebraic algorithms used in X-ray CT. Using simulated test data, I evaluate the viability of algorithmic alternatives that could potentially reduce …
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Optimization of optical computed tomography techniques for the synthesis of particle aggregate models
… optical tomography methods using the Algebraic Reconstruction Technique (ART) algorithm has proved capable of synthesizing 3-D shapes from 2-D projections, with accuracy comparable to that obtained by an X-ray microtomograph (the "gold" standard).</p> <p>This thesis extends and …
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Image reconstruction and imaging configuration optimization with a novel nanotechnology enabled breast tomosynthesis multi-beam X-ray system
… tissues. We are dedicated to optimizing image reconstruction and imaging configuration for a new multi-beam parallel digital breast tomosynthesis prototype system. Several commonly used algorithms from the typical image reconstruction models which were used for iso-centric tomosynthesis systems …
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Proton Computed Tomography: Matrix Data Generation Through General Purpose Graphics Processing Unit Reconstruction
… necessitates matrix-partitioning and parallel reconstruction algorithms to be implemented across some sort of cluster computing architecture. The prototypical algorithm to solve the pCT system is the algebraic reconstruction technique (ART) that has been modified into parallel versions called …
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New algorithms for image analysis, compression, and 2-D spectrum estimation in the radon space
… as well as contrast, is proposed. Selective reconstruction of objects from noisy projections is considered as an application of the 'instantaneous matched-filter'. It involves a combination of the ideas of detection of an object of known shape and location, and an estimation of the associated …
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Study of reactive flow, ground deformation and real-time tomography with applications on CO₂ sequestration
… velocity structure. The new method adapted from Algebraic Reconstruction Technique successfully estimated the changes in the contour and extent of the low-velocity fracture zone with time.
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Three-dimensional water vapor retrieval using a network of scanning compact microwave radiometers
… This work describes and demonstrates the use of algebraic reconstruction tomography to retrieve the 3-D water vapor field from simultaneous brightness temperatures using radiative transfer theory, optimal estimation and Kalman filtering.
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C-ARM TOMOGRAPHIC IMAGING TECHNIQUE FOR DETECTION OF KIDNEY STONES
… stone detection, two groups of tomographic image reconstruction algorithms were developed for C-arm tomosynthesis: direct algorithms such as filtered back projection (FBP) and iterative algorithms such as simultaneous algebraic reconstruction technique (SART), maximum likelihood expectation …
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Imaging Techniques for Proton Range Determination in Proton Therapy
… beam range), SECT uncertainty (beam hardening, reconstruction artifacts, etc.), and patient positioning uncertainty (misalignment, motions, and anatomical changes). Two emerging techniques have been proposed to improve proton SRP estimation accuracy in proton therapy: dual-energy computed …
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TOMOGRAPHIC IMAGE RECONSTRUCTION: IMPLEMENTATION, OPTIMIZATION AND COMPARISON IN DIGITAL BREAST TOMOSYNTHESIS
… then mathematically reconstructs a 3D breast. 3D reconstruction is faced with the challenges of cone-beam and flat-panel geometry, highly incomplete sampling and huge reconstructed volume. In this research, we investigated several representative reconstruction methods such as Filtered …
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Structural Characterization of Photovoltaic Nanocrystals, Single Crystals, and Thin Film Semiconductors.
… the depth composition from a three-dimensional reconstruction using discrete algebraic reconstruction technique (DART) from scanning electron microscopy images. We discover that a post-deposition ligand exchange directly from the native quantum dot ligands to shorter, electrically conducting …
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Two-Phase Flow Measurement using Fast X-ray Line Detector System
… for the non-axisymmetric two-phase flow reconstruction. A comprehensive summary of classical absorption tomography for the two-phase flow study is provided. An in-depth sensitivity study is carried out using synthetic bubbles, aiming to investigate the effect of various uncertainty …
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