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 11 of 11 for “"Tomography Reconstruction"”.
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Interferometric tomography: Reconstruction algorithm, experiment, and comparison with a numerical study.
Interferometric tomography: Reconstruction algorithm, experiment, and comparison with a numerical study.
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Turbine Engine Thrust Measurements Using a Non-Intrusive Acoustic Technique
… exhaust stream was completed for the purpose of tomography reconstruction. This reconstruction technique was able to pick up key features of the flow field.
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Row-Action Methods for Massive Inverse Problems
… using examples from super-resolution imaging, tomography reconstruction, and image classification.
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Machine Learning in Inverse Problems - Learning Regularisation Functionals and Operator Corrections
… approaches to incorporate deep learning into reconstruction algorithms for inverse problems and in particular into variational approaches. We propose and discuss an algorithm to train a neural network as regularisation functional. This is achieved by training the network to tell apart an …
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Computational Advancements for Solving Large-scale Inverse Problems
… as greenhouse gas tracking and computational tomography reconstruction. This dissertation describes advancements in computational tools for solving large-scale inverse problems and for uncertainty quantification. Oftentimes, inverse problems are ill-posed and large-scale. Iterative projection …
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Development of Novel Cardiac CT Methods
… rotation, multi-row detector, and advanced image reconstruction. However, challenges like cone-beam artifact reduction, temporal resolution improvement and x-ray dose reduction must be met to improve and broaden cardiac CT applications. To address these issues, the methods of interior tomography, …
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Data-driven X-ray Tomographic Imaging and Applications to 4D Material Characterization
X-ray tomography is an imaging technique to inspect objects' internal structures with externally measured data by X-ray radiation non-destructively. However, there are concerns about X-ray radiation damage and tomographic acquisition speed in real-life applications. Strategies with insufficient …
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Development of Multifunctional Electrical Impedance Spectroscopy System for Characterization in Plant Phenotyping
… or multispectral imaging, and optical tomography have been developed and studied for the assessment of plant nutrition status and water stress. Although there are several advantages of these methods, they have some limitations as to their environmental sensitivity and confounding …
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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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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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First-order gradient regularisation methods for image restoration: reconstruction of tomographic images with thin structures and denoising piecewise affine images
… (TV) regularisation in image and data space for reconstruction of thin structures from PET data and regularisers given by an infimal-convolution of TV and $L^p$ seminorms for denoising images with piecewise affine structures. In the first part of this thesis, we present a novel variational model …