Image reconstruction on virtual PI-lines using filtered-backprojection in circular cone-beam CT

Lifeng Yu, Dan Xia, Yu Zou, Xiaochuan Pan

Research output: Contribution to journalConference articlepeer-review


Recently, a 3D filtered-backprojection(FBP)-based algorithm for image reconstruction on PI-line segments in a helical cone-beam CT scan has been developed (Zou and Pan, 2004). In the present work, we derive new reconstruction algorithms for circular cone-beam scans based upon this algorithm and a concept of virtual PI-line. We prove that, in the case of conventional full- and short-scan, the newly derived algorithms are mathematically identical to existing algorithms. More importantly, in the case of reduced-scans in which the scanning angle range is less than that in a short-scan, the new algorithms can yield exact region of interest (ROI) reconstruction in mid-plane and approximate ROI reconstruction in off-mid-planes. We have performed a preliminary numerical study that verifies our theoretical assertions.

Original languageEnglish (US)
Article number245
Pages (from-to)2094-2099
Number of pages6
JournalProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Issue numberIII
StatePublished - 2005
EventMedical Imaging 2005 - Image Processing - San Diego, CA, United States
Duration: Feb 13 2005Feb 17 2005


  • Computed tomography (CT)
  • Cone-beam CT
  • Filtered-backprojection (FBP)
  • Image reconstruction
  • Region of interest (ROI)

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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