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 116 for “"Reconstruction algorithms"”.
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Reconstruction algorithms for MRI
This dissertation presents image reconstruction algorithms for Magnetic Resonance Imaging (MRI) that aims to increase the imaging efficiency. Algorithms that reduce imaging time without sacrificing the image quality and mitigate image artifacts are proposed. The goal of increasing the MR efficiency …
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Decentralised network prediction and reconstruction algorithms
… study concerns the decentralised prediction and reconstruction problems in a network. First of all, we propose a decentralised prediction algorithm in the framework of network consensus problem. It allows any individual to compute the consensus value of the whole network in finite time using only …
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Iterative Reconstruction Algorithms for Polyenergetic X-ray Computerized Tomography
A reconstruction algorithm in computerized tomography is a procedure for reconstructing the attenuation coefficientscient, a real-valued function associated with the object of interest, from the measured projection data. Generally speaking, reconstruction algorithms in CT fall into two categories: …
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Reconstruction Algorithms for Novel Joint Imaging Techniques in PET
… cases in PET where the goal is to perform image reconstruction jointly on two data types.</p><p>The first case is the Beta-Gamma image reconstruction. Positron emitting isotopes, such as <sup>11</sup>C, <sup>13</sup>N, and <sup>18</sup>F, can be used to label molecules, and tracers, such as …
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INVESTIGATION OF ADVANCED IMAGE RECONSTRUCTION ALGORITHMS FOR ELECTRON MICROSCOPY
… there is an increasing demand for advanced algorithms to work with new experimental data or improve existing techniques. In this dissertation, we investigate a variety of image reconstruction algorithms for tomography and ptychography - two fast growing areas in electron microscopy. Using …
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Three-Dimensional Photoacoustic Computed Tomography: Imaging Models and Reconstruction Algorithms
… designs. Meanwhile, a variety of image reconstruction algorithms have been developed for the purpose of computed tomography. Most of these algorithms assume full knowledge of the acoustic pressure function on a measurement surface that either encloses the object or extends to infinity, …
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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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DEVELOPMENT OF THREE DIMENSIONAL IN-LINE INSPECTION SYSTEM WITH RECONSTRUCTION ALGORITHMS
… intelligence system and machine learning algorithms to enhance their flow of operations and to address high output demands. This project – development of an inline three dimensional (3D) inspection system with 3D reconstruction algorithms is to further improve the current inspection …
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Modeling and Development of Iterative Reconstruction Algorithms in Emerging X-ray Imaging Technologies
… radiation doses associated with use of analytic reconstruction methods in DPCT, we analyze the numerical and statistical properties of two classes of discrete imaging models that form the basis for iterative image reconstruction. Secondly, to improve image quality in grating-based phase-contrast …
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Simulation and testing of wavefront reconstruction algorithms for the deformable mirror (DeMi) cubesat
The search for exoplanets has discovered thousands of worlds orbiting stars other than our own. To learn more about these worlds, it is necessary to directly image them and study their atmospheric spectra. Especially of interest are Earth-like planets, but they are typically outshined by their host …
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Development of reconstruction algorithms for large volume neutrino telescopes and their application to the KM3NeT detector
… aim of this work was to develop a new muon track reconstruction procedure appropriate for such a detector and evaluate the performances of the telescope through a complete Monte-Carlo simulation. Using this algorithm, the detector sensitivity (flux that can be excluded at 90% CL) and discovery …
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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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Development and Implementation of Fully 3D Statistical Image Reconstruction Algorithms for Helical CT and Half-Ring PET Insert System
… high computational cost, statistical iterative reconstruction algorithms are known to reconstruct high-quality images from noisy tomographic datasets. The overall goal of this work is to design statistical reconstruction software for clinical x-ray CT scanners, and for a novel PET system that …
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Quantification of the performance of 3D sound field reconstruction algorithms using high-density loudspeaker arrays and 3rd order sound field microphone measurements
… described. Afterwards, different spatial audio algorithms such as higher order ambisonics, wave field synthesis and vector based amplitude panning will be described, analyzed and compared. For each spatialization algorithm, the quality of soundfield reproduction will be quantified using listener …
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The Software and Hardware Acceleration for Interior Tomography
… high-speed imaging characteristic. The iterative reconstruction algorithms are becoming more important since they can reconstruct better image qualities from incomplete projection data compared to analytical reconstruction algorithms. Iterative reconstruction algorithms also allow more flexible …
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Parallel algorithms for three dimensional electrical impedance tomography
… the impedance image from the measured data (the reconstruction problem). The reconstruction problem is mathematically difficult and most reconstruction algorithms are computationally intensive. Many of the potential applications of EIT in medical diagnosis and industrial process control depend …
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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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COMPARATIVE STUDIES OF DIFFERENT SYSTEM MODELS FOR ITERATIVE CT IMAGE RECONSTRUCTION
… compared in the content of iterative CT image reconstruction algorithms. One of the key factors that limit the clinical application of an iterative reconstruction algorithm is the high computational cost which mainly depends on the system model. This thesis can serve as the basis for the …
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Fast Backprojection Algorithms for Divergent Beam Tomography
The use of hierarchical backprojection algorithms in divergent beam tomography is found to have good image quality while providing a speedup of 10--80 times over the conventional backprojection algorithm. These fast algorithms will be important when moving to higher resolution images or utilizing …
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Evaluations and Consequences of Tumour Evolution
… in cancer clinical management.Subclonal reconstruction algorithms are commonly applied to characterize genetic intra-tumour heterogeneity from bulk DNA sequencing data. However, it remains unclear how consistently subclonal reconstruction algorithms perform on a large cohort of real-world …
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