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A new anti-aliased projection operator for iterative CT reconstruction
Linköping University, Department of Electrical Engineering, Computer Vision. Linköping University, The Institute of Technology.
Linköping University, Department of Electrical Engineering, Computer Vision. Linköping University, The Institute of Technology.
2007 (English)In: Proceedings of the Ninth International Meeting on Fully Three-dimensional Image Reconstruction in Radiology and Nuclear Medicine, Lindau, Germany, July 9-13, 2007, 2007Conference paper, Published paper (Refereed)
Abstract [en]

A new projection operator is presented and evaluated. This operator has been designed to suppress aliasing artifacts due to (i) false high frequencies contained in the footprint function, and (ii) high frequencies caused by a divergent beam geometry. It is easy to implement and allows for efficient computer implementations. Instead of sampling the footprint as done in most projection operators, the footprint is integrated. This integration suppresses false high frequencies, frequency components that cause aliasing and approximately takes into account the finite size of focus and detector. Two-dimensional parallel beam experiments are presented. These experiments confirm that artifacts due to false high frequencies can be suppressed by the proposed technique. In order to investigate the advantages for divergent beam geometries, current experiments must be complemented with cone-beam experiments.

Place, publisher, year, edition, pages
2007.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-21745OAI: oai:DiVA.org:liu-21745DiVA: diva2:273870
Available from: 2009-10-25 Created: 2009-10-05 Last updated: 2010-02-11

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Sunnegårdh, JohanDanielsson, Per-Erik

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf