Detective quantum efficiency of CT reconstruction: the detection of small objects

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The loss of detection sensitivity incurred by any stage of image processing may normally be characterized by the frequency dependence of the detective quantum efficiency (DQE) of that stage of processing, provided the image is represented in continuous coordinates. However, limitations to the DQE concept arise when discretely sampled projection data are used to obtain discretely sampled computed tomographic (CT) reconstructions. The source of these limitations is the aliasing produced by the discrete sampling which mixes contributions from various frequencies. An associated problem is that the signal-to-noise ratio (SNR) for the detection of an object can depend upon the position ... continued below

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Pages: 9

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Hanson, K.M. January 1, 1979.

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The loss of detection sensitivity incurred by any stage of image processing may normally be characterized by the frequency dependence of the detective quantum efficiency (DQE) of that stage of processing, provided the image is represented in continuous coordinates. However, limitations to the DQE concept arise when discretely sampled projection data are used to obtain discretely sampled computed tomographic (CT) reconstructions. The source of these limitations is the aliasing produced by the discrete sampling which mixes contributions from various frequencies. An associated problem is that the signal-to-noise ratio (SNR) for the detection of an object can depend upon the position of the object relative to the discrete reconstruction pixels. The effective SNR for discrete images must take into account this variation. While there may be no loss in the detection SNR for reconstructions in continuous coordinates (DQE = 100%), a reduction in the SNR will result from aliasing for discrete reconstructions. A simple one-dimensional model elucidates the characteristics of discrete CT reconstruction.

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Pages: 9

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Dep. NTIS, PC A02/MF A01.

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  • Conference on applications of optical instrumentation in medicine VIII, Toronto, Canada, 25 Mar 1979

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  • Report No.: LA-UR-79-544
  • Report No.: CONF-790322-1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 6061396
  • Archival Resource Key: ark:/67531/metadc1106185

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  • January 1, 1979

Added to The UNT Digital Library

  • Feb. 22, 2018, 7:45 p.m.

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  • May 30, 2018, 3:29 p.m.

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Hanson, K.M. Detective quantum efficiency of CT reconstruction: the detection of small objects, article, January 1, 1979; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1106185/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.