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Title: Spatially resolved and observer-free experimental quantification of spatial resolution in tomographic images

Abstract

We present a novel framework and experimental method for the quantification of spatial resolution of a tomography system. The framework adopts the “black box” view of an imaging system, considering only its input and output. The tomography system is locally stimulated with a step input, viz., a sharp edge. The output, viz., the reconstructed images, is analysed by Fourier decomposition of their spatial frequency components, and the local limiting spatial resolution is determined using a cut-off threshold. At no point is an observer involved in the process. The framework also includes a means of translating the quantification region in the imaging space, thus creating a spatially resolved map of objectively quantified spatial resolution. As a case-study, the framework is experimentally applied using a gaseous propane phantom measured by a well-established chemical species tomography system. A spatial resolution map consisting of 28 regions is produced. In isolated regions, the indicated performance is 4-times better than that suggested in the literature and varies by 57% across the imaging space. A mechanism based on adjacent but non-interacting beams is hypothesised to explain the observed behaviour. The mechanism suggests that, as also independently concluded by other methods, a geometrically regular beam array maintains maximummore » objectivity in reconstructions. We believe that the proposed framework, methodology, and findings will be of value in the design and performance evaluation of tomographic imaging arrays and systems.« less

Authors:
;  [1];  [2]
  1. School of Engineering, The University of Edinburgh, Edinburgh EH9 3JL (United Kingdom)
  2. Shell U.K. Limited, Shell Centre, London SE1 7NA (United Kingdom)
Publication Date:
OSTI Identifier:
22392428
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 86; Journal Issue: 3; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BEAMS; IMAGES; PHANTOMS; PROPANE; SPATIAL RESOLUTION; TOMOGRAPHY

Citation Formats

Tsekenis, S. A., McCann, H., and Tait, N.. Spatially resolved and observer-free experimental quantification of spatial resolution in tomographic images. United States: N. p., 2015. Web. doi:10.1063/1.4913922.
Tsekenis, S. A., McCann, H., & Tait, N.. Spatially resolved and observer-free experimental quantification of spatial resolution in tomographic images. United States. doi:10.1063/1.4913922.
Tsekenis, S. A., McCann, H., and Tait, N.. Sun . "Spatially resolved and observer-free experimental quantification of spatial resolution in tomographic images". United States. doi:10.1063/1.4913922.
@article{osti_22392428,
title = {Spatially resolved and observer-free experimental quantification of spatial resolution in tomographic images},
author = {Tsekenis, S. A. and McCann, H. and Tait, N.},
abstractNote = {We present a novel framework and experimental method for the quantification of spatial resolution of a tomography system. The framework adopts the “black box” view of an imaging system, considering only its input and output. The tomography system is locally stimulated with a step input, viz., a sharp edge. The output, viz., the reconstructed images, is analysed by Fourier decomposition of their spatial frequency components, and the local limiting spatial resolution is determined using a cut-off threshold. At no point is an observer involved in the process. The framework also includes a means of translating the quantification region in the imaging space, thus creating a spatially resolved map of objectively quantified spatial resolution. As a case-study, the framework is experimentally applied using a gaseous propane phantom measured by a well-established chemical species tomography system. A spatial resolution map consisting of 28 regions is produced. In isolated regions, the indicated performance is 4-times better than that suggested in the literature and varies by 57% across the imaging space. A mechanism based on adjacent but non-interacting beams is hypothesised to explain the observed behaviour. The mechanism suggests that, as also independently concluded by other methods, a geometrically regular beam array maintains maximum objectivity in reconstructions. We believe that the proposed framework, methodology, and findings will be of value in the design and performance evaluation of tomographic imaging arrays and systems.},
doi = {10.1063/1.4913922},
journal = {Review of Scientific Instruments},
number = 3,
volume = 86,
place = {United States},
year = {Sun Mar 15 00:00:00 EDT 2015},
month = {Sun Mar 15 00:00:00 EDT 2015}
}