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Schematic of x-ray phase-contrast PIV experiment.
Set of x-ray phase-contrast images of flowing blood contained within cylindrical vessel. (a) Raw image (vertical white line formed by a ridge on outside of tube) with superimposed velocimetric profile, showing minimum flow velocities at the wall and maximum in the center. (b) Average-subtracted image. (c) Average-subtracted image after Fourier mask filtering. Magnified inset demonstrates characteristic speckled interference pattern constituting the signal used for PIV.
Cross-correlation peaks (a) before and (b) after the application of phase retrieval. The relevant region of the full interrogation window has been magnified for clarity. In (c), the theoretical PDF for parabolic flow of finite sized particles is shown for comparison.
(a) Sum of velocities through projection (calculated directly from cross-correlation peak integral) and (b) reconstructed radial velocity profile.
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