Image reconstruction with a shift-variant filtration in circular cone-beam CT

Lifeng Yu, Xiaochuan Pan, Charles A. Pelizzari

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

It is well known that cone-beam data acquired with a circular orbit are insufficient for exact image reconstruction. Despite this, because a cone-beam scanning configuration with a circular orbit is easy to implement in practice, it has been widely employed for data acquisition in, e.g., micro-CT and CT imaging in radiation therapy. The algorithm developed by Feldkamp, Davis, and Kress (FDK) and its modifications, such as the Tent-FDK (T-FDK) algorithm, have been used for image reconstruction from circular cone-beam data. In this work, we present an algorithm with spatially shift-variant filtration for image reconstruction in circular cone-beam CT. We performed computer-simulation studies to compare the proposed and existing algorithms. Numerical results in these studies demonstrated that the proposed algorithm has resolution properties comparable to, and noise properties better than, the FDK algorithm. As compared to the T-FDK algorithm, our proposed algorithm reconstructs images with an improved in-plane spatial resolution.

Original languageEnglish (US)
Pages (from-to)213-221
Number of pages9
JournalInternational Journal of Imaging Systems and Technology
Volume14
Issue number5
DOIs
StatePublished - Dec 1 2004

Keywords

  • Computed tomography (CT)
  • Cone-beam projection
  • Image reconstruction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Software
  • Computer Vision and Pattern Recognition
  • Electrical and Electronic Engineering

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