Fast Plane Wave 2-D Vector Flow Imaging Using Transverse Oscillation and Directional Beamforming

摘要: Several techniques can estimate the 2-D velocity vector in ultrasound. Directional beamforming (DB) estimates blood flow velocities with a higher precision and accuracy than transverse oscillation (TO), but at cost of high load when estimating angle. In this paper, it is proposed to use TO an initial angle, which then refined DB step. Velocity magnitude estimated along direction using cross correlation. It shown that suggested TO-DB method improve performance compared TO, load, 4.6 times larger for seven smaller conventional DB. Steered plane wave transmissions are employed frame rate imaging, parabolic peak 0.5 m/s simulated straight vessels beam-to-flow angles from 45° 90°. The angle bias standard deviation (SD) less 2°, SD 2%. When only ranges 2° 17° up 7%. Bias within 2% slightly 4% TO-DB. same trends observed measurements although bias. Simulations realistic carotid bifurcation model provide visualization complex flow, spread 7.1 cm/s TO-DB, while 11.8 TO. However, underestimated systole as indicated by regression value 0.97 0.85 An vivo scanning used estimations profile over cardiac cycle 4.2% 3.2%