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