Why the study?
High-frame-rate ultrasound for blood flow velocity vector estimation suffers from clutters in arterial wall imaging, making simultaneous vector estimation using focused transmit beams desirable.
A multi-angle Doppler method with focused transmit beams can estimate blood flow velocity vectors simultaneously with soft tissue imaging, potentially reducing clutter.
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May enable simultaneous arterial wall and vector flow imaging with focused beams; leaves open clinical validation in carotid studies.
High-frame-rate ultrasound imaging with plane wave transmissions is a predominant method of blood flow imaging, and methods for estimation of blood flow velocity vectors have been developed based on high-frame-rate imaging. On the other hand, in imaging of soft tissues, such as arterial walls and atherosclerotic plaques, high-frame-rate imaging sometimes suffers from high-level clutters. Even in observation of the arterial wall with a focused transmit beam, it would be highly beneficial if blood flow velocity vectors could be estimated simultaneously. We conducted a preliminary study on the estimation of blood flow velocity vectors based on a multi-angle Doppler method with focused transmit beam and parallel receive beamforming. It was shown that the lowest estimation error was achieved at a steering angle of 25° by simulation. Moreover, velocity vectors with typical velocity magnitudes and directions could be obtained by the proposed method in in vivo measurement of a carotid artery.
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Hasegawa et al. (2021) studied this question.
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