Use of multiple CT scans to accommodate large objects and stretch dynamic range of detectability

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Description

Rotate-only X-ray CT scanners are preferred for their speed and dose utilization, but suffer from the restriction that the scanned object must fit within the radiation beam. In addition, the ratio of signals unattenuated by air paths to those penetrating thick, dense objects often exceeds the dynamic range of conventional X-ray detectors. Both of these disadvantages can be removed for objects larger than the X-ray beam by taking multiple scans, each of which exposes only part of the object. These partial data sets can then be merged to produce a complete data set. For most objects, it is also possible ... continued below

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13 p.

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Sivers, E.A. September 1, 1994.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 17 times , with 5 in the last month . More information about this report can be viewed below.

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Description

Rotate-only X-ray CT scanners are preferred for their speed and dose utilization, but suffer from the restriction that the scanned object must fit within the radiation beam. In addition, the ratio of signals unattenuated by air paths to those penetrating thick, dense objects often exceeds the dynamic range of conventional X-ray detectors. Both of these disadvantages can be removed for objects larger than the X-ray beam by taking multiple scans, each of which exposes only part of the object. These partial data sets can then be merged to produce a complete data set. For most objects, it is also possible to separately expose regions in which the ratios between the extremes of attenuation are much lower than that between air and the maximum path length. It is therefore possible to use a higher flux to image denser regions, improving signal-to-noise ratios and yielding images superior to those of larger scanners having the same dynamic range,

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13 p.

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OSTI as DE95005852

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  • 13. international conference on the application of accelerators in research and industry, Denton, TX (United States), 7-10 Nov 1994

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  • Other: DE95005852
  • Report No.: ANL/ET/CP--83334
  • Report No.: CONF-941129--19
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/34396 | External Link
  • Office of Scientific & Technical Information Report Number: 34396
  • Archival Resource Key: ark:/67531/metadc686251

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  • September 1, 1994

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  • July 25, 2015, 2:20 a.m.

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  • Dec. 16, 2015, 5:23 p.m.

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Sivers, E.A. Use of multiple CT scans to accommodate large objects and stretch dynamic range of detectability, report, September 1, 1994; Illinois. (digital.library.unt.edu/ark:/67531/metadc686251/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.