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X-ray Phase-contrast imaging

Martin Bech

Universitetslektor

X-ray Phase-contrast imaging

Quantitative X-ray phase-contrast computed tomography at 82 keV

Författare

  • Marian Willner
  • Martin Bech
  • Julia Herzen
  • Irene Zanette
  • Dieter Hahn
  • Johannes Kenntner
  • Juergen Mohr
  • Alexander Rack
  • Timm Weitkamp
  • Franz Pfeiffer

Summary, in English

Potential applications of grating-based X-ray phase-contrast imaging are investigated in various fields due to its compatibility with laboratory X-ray sources. So far the method was mainly restricted to X-ray energies below 40 keV, which is too low to examine dense or thick objects, but a routine operation at higher energies is on the brink of realisation. In this study, imaging results obtained at 82 keV are presented. These comprise a test object consisting of well-defined materials for a quantitative analysis and a tooth to translate the findings to a biomedical sample. Measured linear attenuation coefficients mu and electron densities rho(e) are in good agreement with theoretical values. Improved contrast-to-noise ratios were found in phase contrast compared to attenuation contrast. The combination of both contrast modalities further enables to simultaneously assess information on density and composition of materials with effective atomic numbers (Z) over tilde > 8. In our biomedical example, we demonstrate the possibility to detect differences in mass density and calcium concentration within teeth. (C) 2013 Optical Society of America

Avdelning/ar

  • Medicinsk strålningsfysik, Lund

Publiceringsår

2013

Språk

Engelska

Sidor

4155-4166

Publikation/Tidskrift/Serie

Optics Express

Volym

21

Issue

4

Dokumenttyp

Artikel i tidskrift

Förlag

Optical Society of America

Ämne

  • Atom and Molecular Physics and Optics

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1094-4087