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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 13 — Jun. 30, 2014
  • pp: 15447–15458

Tilted-grating approach for scanning-mode X-ray phase contrast imaging

Carolina Arboleda, Zhentian Wang, and Marco Stampanoni  »View Author Affiliations

Optics Express, Vol. 22, Issue 13, pp. 15447-15458 (2014)

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Among the existent X-ray phase-contrast modalities, grating interferometry appears as a very promising technique for commercial applications, since it is compatible with conventional X-ray tubes and is robust from a mechanical point of view. However, since applications such as medical imaging and homeland security demand covering a considerable field of view, the fabrication of large-area gratings, which is known to be challenging and expensive, would be needed. A scanning setup is a good solution for this issue, because it uses cheaper line instead of large-area 2D detectors and, therefore, would require smaller gratings. In such a setup, the phase-retrieval using the conventional phase-stepping approach would be very slow, so having a faster method to record the signals becomes fundamental. To tackle this problem, we present a scanning-mode grating interferometer design, in which a grating is tilted to form Moiré fringes perpendicular to the grating lines. The sample is then translated along the fringes, so each line detector records a different phase step for each slice of the sample. This new approach was tested both in a simulated scenario and in an experimental setting, and its performance was quantitatively satisfactory compared to the traditional phase-stepping method and another existing scanning-mode technique.

© 2014 Optical Society of America

OCIS Codes
(100.5070) Image processing : Phase retrieval
(120.4120) Instrumentation, measurement, and metrology : Moire' techniques
(340.7440) X-ray optics : X-ray imaging
(340.7450) X-ray optics : X-ray interferometry

ToC Category:
X-ray Optics

Original Manuscript: May 13, 2014
Revised Manuscript: June 10, 2014
Manuscript Accepted: June 10, 2014
Published: June 17, 2014

Virtual Issues
Vol. 9, Iss. 8 Virtual Journal for Biomedical Optics

Carolina Arboleda, Zhentian Wang, and Marco Stampanoni, "Tilted-grating approach for scanning-mode X-ray phase contrast imaging," Opt. Express 22, 15447-15458 (2014)

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