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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 17 — Aug. 15, 2011
  • pp: 16560–16573

Iterative reconstruction in x-ray computed laminography from differential phase measurements

Sébastien Harasse, Wataru Yashiro, and Atsushi Momose  »View Author Affiliations


Optics Express, Vol. 19, Issue 17, pp. 16560-16573 (2011)
http://dx.doi.org/10.1364/OE.19.016560


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Abstract

Phase-contrast X-ray computed laminography is demonstrated for the volume reconstruction of extended flat objects, not suitable to the usual tomographic scan. Using a Talbot interferometer, differential phase measurements are obtained and used to reconstruct the real part of the complex refractive index. The specific geometry of laminography leads to unsampled frequencies in a double cone in the reciprocal space, which degrades the spatial resolution in the direction normal to the object plane. First, the filtered backprojection formula from differential measurements is derived. Then, reconstruction is improved by the use of prior information of compact support and limited range, included in an iterative filtered backprojection algorithm. An implementation on GPU hardware was required to handle the reconstruction of volumes within a reasonable time. A synchrotron radiation experiment on polymer meshes is reported and results of the iterative reconstruction are compared with the simpler filtered backprojection.

© 2011 OSA

OCIS Codes
(110.6760) Imaging systems : Talbot and self-imaging effects
(110.6955) Imaging systems : Tomographic imaging

ToC Category:
Imaging Systems

History
Original Manuscript: June 16, 2011
Revised Manuscript: August 3, 2011
Manuscript Accepted: August 4, 2011
Published: August 12, 2011

Virtual Issues
Vol. 6, Iss. 9 Virtual Journal for Biomedical Optics

Citation
Sébastien Harasse, Wataru Yashiro, and Atsushi Momose, "Iterative reconstruction in x-ray computed laminography from differential phase measurements," Opt. Express 19, 16560-16573 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-17-16560


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