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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 3 — Feb. 1, 2010
  • pp: 2368–2379

Vector tomographic X-ray phase contrast velocimetry utilizing dynamic blood speckle

Sarah C. Irvine, David M. Paganin, R. Aidan Jamison, Stephen Dubsky, and Andreas Fouras  »View Author Affiliations


Optics Express, Vol. 18, Issue 3, pp. 2368-2379 (2010)
http://dx.doi.org/10.1364/OE.18.002368


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Abstract

We present a time-resolved tomographic reconstruction of the velocity field associated with pulsatile blood flow through a rotationally-symmetric stenotic vessel model. The in-vitro sample was imaged using propagation-based phase contrast with monochromated X-rays from a synchrotron undulator source, and a fast shutter-synchronized detector with high-resolution used to acquire frames of the resulting dynamic speckle pattern. Having used phase retrieval to decode the phase contrast from the speckle patterns, the resulting projected-density maps were analysed using the statistical correlation methods of particle image velocimetry (PIV). This yields the probability density functions of blood-cell displacement within the vessel. The axial velocity-field component of the rotationally-symmetric flow was reconstructed using an inverse-Abel transform. A modified inverse-Abel transform was used to reconstruct the radial component. This vector tomographic phase-retrieval velocimetry was performed over the full pumping cycle, to completely characterize the velocity field of the pulsatile blood flow in both space and time.

© 2010 OSA

OCIS Codes
(110.6150) Imaging systems : Speckle imaging
(110.6960) Imaging systems : Tomography
(120.7250) Instrumentation, measurement, and metrology : Velocimetry
(170.6920) Medical optics and biotechnology : Time-resolved imaging
(340.7440) X-ray optics : X-ray imaging
(110.3010) Imaging systems : Image reconstruction techniques

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: December 3, 2009
Manuscript Accepted: December 24, 2009
Published: January 21, 2010

Virtual Issues
Vol. 5, Iss. 4 Virtual Journal for Biomedical Optics

Citation
Sarah C. Irvine, David M. Paganin, R. Aidan Jamison, Stephen Dubsky, and Andreas Fouras, "Vector tomographic X-ray phase contrast velocimetry utilizing dynamic blood speckle," Opt. Express 18, 2368-2379 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-3-2368


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