Image reconstruction in asymmetric fan-beam scans with spatially varying focal lengths

Lifeng Yu, Xiaochuan Pan, Charles A. Pelizzari

Research output: Contribution to journalConference articlepeer-review


We propose a generalized algorithm for image reconstruction from data acquired in an asymmetric fan-beam configuration with a spatially varying focal length. This algorithm is an extension of our previous algorithm for fan-beam computed tomography (CT) that involves a shift-variant filtering. As compared to the existing algorithms, the proposed algorithm involves no additional explicit interpolation and eliminates the spatially-variant weighting factor. Therefore, it retains the spatial resolution and is less susceptible to data noise. We performed computer-simulation studies to validate and evaluate the proposed algorithm, and quantitative results demonstrate that the proposed algorithm possesses desirable noise and numerical properties.

Original languageEnglish (US)
Pages (from-to)678-684
Number of pages7
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5370 I
StatePublished - 2004
EventProgress in Biomedical Optics and Imaging - Medical Imaging 2004: Imaging Processing - San Diego, CA, United States
Duration: Feb 16 2004Feb 19 2004


  • Asymmetric configuration
  • Computed tomography (CT)
  • Fan-beam projection
  • Image reconstruction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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