Characterization of algorithms and performance of a fine-resolution active interrogation system
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Maloney, Luke J.
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Abstract
Active interrogation is a crucial tool in modern applications of nonintrusive assay: x- and gamma-ray interrogation systems are commonly employed in cargo inspection as well as in medical imaging, among other applications. In this work, a novel linear imaging array is characterized, and reconstruction algorithm developed, for active interrogation. The system consists of lutetium-yttrium oxyorthosilicate (LYSO) scintillator crystals in small form factor, as well as fused silica quartz elements, employed as a radiation-detecting scintillator and Cerenkov radiator, respectively. Cerenkov radiators here represent a low-cost alternative to scintillators for conversion of radiation to optical photons. Silicon photomultipliers (SiPMs) are used for optical light readout. Challenges associated with imaging using disparate detector element types are discussed, and performance results from ANSI-like imaging tests are presented. The system achieves good spatial resolution (within 4 mm) and is capable of detection of at least 12 AWG wire. Contrast sensitivity is at most 2% under the described test conditions.
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2020-07-06
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Dissertation