Tomographic reconstruction using tilted Laue analyser-based X-ray phase-contrast imaging

M. C. Chalmers, M. J. Kitchen, K. Uesugi, G. Falzon, P. Quin, K. M. Pavlov

Research output: Contribution to journalArticlepeer-review

Abstract

Analyser-based phase-contrast imaging (ABPCI) is a highly sensitive phase-contrast imaging method that produces high-contrast images of weakly absorbing materials. However, it is only sensitive to phase gradient components lying in the diffraction plane of the analyser crystal [i.e. in one dimension (1-D)]. In order to accurately account for and measure phase effects produced by the wavefield-sample interaction, ABPCI and other 1-D phase-sensitive methods must achieve 2-D phase gradient sensitivity. An inclined geometry method was applied to a Laue geometry setup for X-ray ABPCI through rotation of the detector and object about the optical axis. This allowed this traditionally 1-D phase-sensitive phase-contrast method to possess 2-D phase gradient sensitivity. Tomographic datasets were acquired over 360° of a multi-material phantom with the detector and sample tilted by 8°. The real and imaginary parts of the refractive index were reconstructed for the phantom.

Original languageEnglish
Pages (from-to)283-291
Number of pages9
JournalJournal of synchrotron radiation
Volume28
Issue numberPart 1
DOIs
Publication statusPublished - 1 Jan 2021

Keywords

  • analyser-based imaging
  • phase retrieval
  • phase-contrast imaging
  • phase-contrast tomography

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