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

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

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Tsekenis, S. A. McCann, H. Tait, N.
Description	Country affiliation: United kingdom Author Affiliation: Tsekenis SA ( School of Engineering, The University of Edinburgh, Edinburgh EH9 3JL, United Kingdom.); Tait N ( Shell U.K. Limited, Shell Centre, London SE1 7NA, United Kingdom.); McCann H ( School of Engineering, The University of Edinburgh, Edinburgh EH9 3JL, United Kingdom.)
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 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.
ISSN	00346748
Issue Number	3
Journal	Review of Scientific Instruments
Volume Number	86
e-ISSN	10897623
Language	English
Publisher	American Institute of Physics
Publisher Date	2015-03-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Physics Discipline Chemistry
Content Type	Text
Resource Type	Article
Subject	Medicine Instrumentation

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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