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A combined speckle tracking and phase-shift estimation approach for 2D blood flow imaging in the carotid bifurcation

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3 Author(s)
Swillens, A. ; Inst. Biomed. Technol.-bioMMeda, Ghent Univ., Ghent, Belgium ; Segers, P. ; Lovstakken, L.

A 2D blood velocity estimator is presented combining speckle tracking (ST) and phase-shift estimation (PE) to measure lateral (vx) and axial (vz) velocities respectively. Estimator properties were assessed in a computer model of a carotid bifurcation using ultrasound simulations based on computational fluid dynamics, allowing validation towards a ground truth. Simulation results were supported with in-vivo data of a healthy carotid. ST and PE estimates were combined as: 1) vx from 2D-ST and vz from PE, 2) vx from 2D-ST and vz from PE with aliasing correction based on ST, 3) vz from PE and only lateral ST for vx. Regression analysis showed a 35-77 % decrease in standard deviation for vz for PE compared to ST. Aliasing correction based on ST improved results but also introduced spurious artifacts. A marginal decrease in performance was observed when only tracking laterally.

Published in:

Ultrasonics Symposium (IUS), 2010 IEEE

Date of Conference:

11-14 Oct. 2010

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