Exact fan-beam reconstruction via ramp-filtered backprojection and local compensation

Guang Hong Chen, Ranjini Tolakanahalli, Tingliang Zhuang, Brian E. Nett, Jiang Hsieh

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


A novel exact fan-beam image reconstruction formula is presented and validated using both mathematical phantom data and clinical data. This algorithm takes the form of the standard ramp filtered backprojection (FBP) algorithm plus local compensation terms. An equal weighting scheme is utilized in this algorithm in order to properly account for redundantly measured projection data. The algorithm has the desirable property of maintaining a mathematically exact result for: the full scan mode (2π), the short scan mode (π+ full fan angle), and the super-short scan mode (less than (π+ full fan angle)). Another desirable feature of this algorithm is that it is derivative-free. The derivative-free nature of this algorithm distinguishes it from other exact fan-beam FBP algorithms.

Original languageEnglish (US)
Article number115
Pages (from-to)1014-1024
Number of pages11
JournalProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Issue numberII
StatePublished - 2005
Externally publishedYes
EventMedical Imaging 2005 - Physics of Medical Imaging - San Diego, CA, United States
Duration: Feb 13 2005Feb 15 2005


  • Artifacts
  • FBP
  • Fan-beam
  • Super-short

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging


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