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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 3 — Feb. 11, 2013
  • pp: 2674–2682

Rytov approximation for x-ray phase imaging

Yongjin Sung and George Barbastathis  »View Author Affiliations


Optics Express, Vol. 21, Issue 3, pp. 2674-2682 (2013)
http://dx.doi.org/10.1364/OE.21.002674


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Abstract

In this study, we check the accuracy of the first-order Rytov approximation with a homogeneous sphere as a candidate for application in x-ray phase imaging of large objects e.g., luggage at the airport, or a human patient. Specifically, we propose a validity condition for the Rytov approximation in terms of a parameter V that depends on the complex refractive index of the sphere and the Fresnel number, for Fresnel numbers larger than 1000. In comparison with the exact Mie solution, we provide the accuracy of the Rytov approximation in predicting the intensity and phase profiles after the sphere. For large objects, where the Mie solution becomes numerically impractical, we use the principle of similarity to predict the accuracy of the Rytov approximation without explicit calculation of the Mie solution. Finally, we provide the maximum radius of the sphere for which the first order Rytov approximation remains valid within 1% accuracy.

© 2013 OSA

OCIS Codes
(340.7440) X-ray optics : X-ray imaging
(290.5825) Scattering : Scattering theory

ToC Category:
X-ray Optics

History
Original Manuscript: November 30, 2012
Revised Manuscript: January 15, 2013
Manuscript Accepted: January 16, 2013
Published: January 28, 2013

Virtual Issues
Vol. 8, Iss. 3 Virtual Journal for Biomedical Optics

Citation
Yongjin Sung and George Barbastathis, "Rytov approximation for x-ray phase imaging," Opt. Express 21, 2674-2682 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-3-2674


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