A reconstruction method for cone-beam differential x-ray phase-contrast computed tomography

Research output: Contribution to journalArticle

Abstract

Most existing differential phase-contrast computed tomography (DPC-CT) approaches are based on three kinds of scanning geometries, described by parallel-beam, fan-beam and cone-beam. Due to the potential of compact imaging systems with magnified spatial resolution, cone-beam DPC-CT has attracted significant interest. In this paper, we report a reconstruction method based on a back-projection filtration (BPF) algorithm for cone-beam DPC-CT. Due to the differential nature of phase contrast projections, the algorithm restrains from differentiation of the projection data prior to back-projection, unlike BPF algorithms commonly used for absorption-based CT data. This work comprises a numerical study of the algorithm and its experimental verification using a dataset measured with a three-grating interferometer and a micro-focus x-ray tube source. Moreover, the numerical simulation and experimental results demonstrate that the proposed method can deal with several classes of truncated cone-beam datasets. We believe that this feature is of particular interest for future medical cone-beam phase-contrast CT imaging applications. (C) 2012 Optical Society of America

Details

Authors
  • Jian Fu
  • Astrid Velroyen
  • Renbo Tan
  • Junwei Zhang
  • Liyuan Chen
  • Arne Tapfer
  • Martin Bech
  • Franz Pfeiffer
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Atom and Molecular Physics and Optics
Original languageEnglish
Pages (from-to)21512-21519
JournalOptics Express
Volume20
Issue number19
Publication statusPublished - 2012
Publication categoryResearch
Peer-reviewedYes