Plane-wave transverse oscillation for high-frame-rate 2-D vector flow imaging

摘要: Transverse oscillation (TO) methods introduce oscillations in the pulse–echo field (PEF) along direction transverse to ultrasound propagation direction. This may be exploited extend flow investigations toward multidimensional estimates. In this paper, TOs are coupled with transmission of plane waves (PWs) reconstruct high-framerate RF images bidirectional field. Such then processed by a 2-D phase-based displacement estimator produce vector maps at thousands frames per second. First, capability generating after PW transmissions was thoroughly investigated varying lateral wavelength, burst length, and frequency. Over entire region interest, generated wavelengths, compared designed ones, presented bias standard deviation −3.3 ± 5.7% 10.6 7.4% simulations experiments, respectively. The performance ultrafast mapping method also assessed evaluating differences between estimated velocities expected ones. Both experiments show overall biases lower than 20% when beam-to-flow angle, peak velocity, depth interest. vivo applications on common carotid brachial arteries presented.