Keywords and Phrases
Compressed sensing; Computed Tomography; Limited angle CT; Post Irradiation Examination; Sparse view CT
The core components (e.g. fuel assemblies, spacer grids, control rods) of the nuclear reactors encounter harsh environment due to high temperature, physical stress, and a tremendous level of radiation. The integrity of these elements is crucial for safe operation of the nuclear power plants. The Post Irradiation Examination (PIE) can reveal information about the integrity of the elements during normal operations and off‐normal events. Computed tomography (CT) is a tool for evaluating the structural integrity of elements non-destructively. CT requires many projections to be acquired from different view angles after which a mathematical algorithm is adopted for reconstruction. Obtaining many projections is laborious and expensive in nuclear industries. Reconstructions from a small number of projections are explored to achieve faster and cost-efficient PIE. Classical reconstruction algorithms (e.g. filtered back projection) cannot offer stable reconstructions from few projections and create severe streaking artifacts. In this thesis, conventional algorithms are reviewed, and new algorithms are developed for reconstructions of the nuclear fuel assemblies using few projections. CT reconstruction from few projections falls into two categories: the sparse-view CT and the limited-angle CT or tomosynthesis. Iterative reconstruction algorithms are developed for both cases in the field of compressed sensing (CS). The performance of the algorithms is assessed using simulated projections and validated through real projections. The thesis also describes the systematic strategy towards establishing the conditions of reconstructions and finds the optimal imaging parameters for reconstructions of the fuel assemblies from few projections. "--Abstract, page iii.
Lee, Hyoung Koo
Liu, Xin (Mining & Nuclear Engr)
Mueller, Gary Edward, 1954-
Alajo, Ayodeji Babatunde
Moss, Randy Hays, 1953-
Mining and Nuclear Engineering
Ph. D. in Nuclear Engineering
Idaho National Laboratory
Missouri University of Science and Technology
xv, 105 pages
© 2015 Muhammad Imran Khan Abir, All rights reserved.
Dissertation - Open Access
Library of Congress Subject Headings
Nuclear fuel elements -- Testing
Nuclear power plants -- Quality control
Electronic OCLC #
Abir, Muhammad Imran Khan, "Iterative CT reconstruction from few projections for the nondestructive post irradiation examination of nuclear fuel assemblies" (2015). Doctoral Dissertations. 2400.