Transform-domain penalized-likelihood filtering of projection data

Ian Atkinson, Farzad Kamalabadi

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We present motivation for performing the filtering step of FBP in a non-Radon domain. Specifically, we show that for penalized-likelihood regularization, with a shift-invariant penalty function, filtering noisy projection data in a domain for which the true projection data is sparse yields filtered data that is more faithful to the ideal filtered data than directly filtering the Radon-domain data. In contrast to simply penalizing across angles, the proposed method exploits correlation in the angle dimension. This allows for simple penalty matrices to be constructed, enables penalty coefficient to be calculated in a straightforward manner, and results in easily an computed, closed-form solution for the regularizing filters. Reconstructions employing this transform-domain filtering are superior to their Radon-domain filtered counterparts.

Original languageEnglish (US)
Title of host publication2006 IEEE International Conference on Image Processing, ICIP 2006 - Proceedings
Number of pages4
StatePublished - 2006
Event2006 IEEE International Conference on Image Processing, ICIP 2006 - Atlanta, GA, United States
Duration: Oct 8 2006Oct 11 2006

Publication series

NameProceedings - International Conference on Image Processing, ICIP
ISSN (Print)1522-4880


Other2006 IEEE International Conference on Image Processing, ICIP 2006
Country/TerritoryUnited States
CityAtlanta, GA


  • Filtering
  • Image reconstruction
  • Tomography

ASJC Scopus subject areas

  • Software
  • Computer Vision and Pattern Recognition
  • Signal Processing


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