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 18 of 18 for “"Algebraic Reconstruction Technique"”.
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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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The Study of Binary Steering Algorithms in Discrete Tomography
… project we will study the binary steering 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 …
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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
… is developed and integrated with tomographic techniques to reconstruct temperature contours. A low velocity plume at around 450 °F exiting through a rectangular duct (3.25 by 10 inches) was used for validation and reconstruction. 0.3 % static temperature relative error compared with …
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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
… radiation therapy compared with the current techniques, which are based on X-ray CT. Images are reconstructed in pCT by solving a large and sparse system of linear equations. The size of the system necessitates matrix-partitioning and parallel reconstruction algorithms to be implemented …
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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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C-ARM TOMOGRAPHIC IMAGING TECHNIQUE FOR DETECTION OF KIDNEY STONES
… (3D) nephrolithiasis and kidney stones detection technique, computed tomography (CT) provides detailed cross-sectional images as well as 3D structure of kidney from moving the x-ray beam in a circle around the body. However, the risk of CT scans of the kidney is relatively higher exposure to …
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Imaging Techniques for Proton Range Determination in Proton Therapy
… (SECT) scan through a stoichiometric calibration technique. This technique is subjected to a variety of factors that congregate on the uncertainties in SPR estimation, including the calibration uncertainty (up to 0.5% to 1.8% of the total proton beam range), SECT uncertainty (beam hardening, …
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TOMOGRAPHIC IMAGE RECONSTRUCTION: IMPLEMENTATION, OPTIMIZATION AND COMPARISON IN DIGITAL BREAST TOMOSYNTHESIS
… breast imaging is a potentially more valuable 3D technique for breast cancer detection. The limitations of current tomosynthesis systems include a longer scanning time than a conventional digital X-ray modality and a low spatial resolution due to the movement of the single X-ray source. Dr.Otto …
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Two-Phase Flow Measurement using Fast X-ray Line Detector System
… between the x-ray and the other measurement techniques. Finally, various 2-D tomography algorithms are implemented 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 …
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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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Robust and efficient methods for proton computed tomography.
… Since the early developments of this imaging technique in 1970's, there have been significant improvements regarding the reconstruction of accurate RSP which makes pCT a reliable alternative to X-ray CT for planning proton therapy treatments. There are several conditions in pCT that can …
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Optimal transport: theory, algorithms and applications
… algorithm (GIS) or simultaneous multiplicative algebraic reconstruction technique (SMART) and regularized OT with affine constraints. We give a new proof for the convergence of a block-iterative version of this algorithm, which fits well to the OT setting. Moreover, we show that this algorithm …