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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 23 — Nov. 18, 2013
  • pp: 27946–27963

An approach to increasing the resolution of industrial CT images based on an aperture collimator

Yining Zhu, Defeng Chen, Yunsong Zhao, Hongwei Li, and Peng Zhang  »View Author Affiliations


Optics Express, Vol. 21, Issue 23, pp. 27946-27963 (2013)
http://dx.doi.org/10.1364/OE.21.027946


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Abstract

The spatial resolution of CT images is dominated by the focal spot size when it is large relative to the detector cells. We propose an approach to increase the spatial resolution by utilizing an aperture collimator. The aperture collimator is specially designed and placed in front of the X-ray source so that the rays penetrating the collimator form a set of narrow fan beams. Then an iterative algorithm is introduced to reconstruct CT images from the data obtained by scanning the narrow fan beams. Numerical experiments show that the proposed approach could significantly increase the resolution of the CT images. Furthermore, this approach is also robust against some challenging cases, such as the examination of low contrast object, reconstruction based on multi-energy data and perturbation of geometric errors in CT systems.

© 2013 OSA

OCIS Codes
(170.7440) Medical optics and biotechnology : X-ray imaging
(340.7430) X-ray optics : X-ray coded apertures

ToC Category:
Medical Optics and Biotechnology

History
Original Manuscript: April 16, 2013
Revised Manuscript: September 20, 2013
Manuscript Accepted: October 23, 2013
Published: November 7, 2013

Virtual Issues
Vol. 9, Iss. 1 Virtual Journal for Biomedical Optics

Citation
Yining Zhu, Defeng Chen, Yunsong Zhao, Hongwei Li, and Peng Zhang, "An approach to increasing the resolution of industrial CT images based on an aperture collimator," Opt. Express 21, 27946-27963 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-23-27946


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