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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Plane-wave transverse oscillation for high-frame-rate 2-D vector flow imaging
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Plane-wave transverse oscillation for high-frame-rate 2-D vector flow imaging

机译：平面波横向振荡用于高帧率二维矢量流成像

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摘要

Transverse oscillation (TO) methods introduce oscillations in the pulse???echo field (PEF) along the direction transverse to the ultrasound propagation direction. This may be exploited to extend flow investigations toward multidimensional estimates. In this paper, the TOs are coupled with the transmission of plane waves (PWs) to reconstruct high-framerate RF images with bidirectional oscillations in the pulse???echo field. Such RF images are then processed by a 2-D phase-based displacement estimator to produce 2-D vector flow maps at thousands of frames per second. First, the capability of generating TOs after PW transmissions was thoroughly investigated by varying the lateral wavelength, the burst length, and the transmission frequency. Over the entire region of interest, the generated lateral wavelengths, compared with the designed ones, presented bias and standard deviation of ???3.3 ?? 5.7% and 10.6 ?? 7.4% in simulations and experiments, respectively. The performance of the ultrafast vector flow mapping method was also assessed by evaluating the differences between the estimated velocities and the expected ones. Both simulations and experiments show overall biases lower than 20% when varying the beam-to-flow angle, the peak velocity, and the depth of interest. In vivo applications of the method on the common carotid and the brachial arteries are also presented.
机译：横向振荡（TO）方法沿垂直于超声传播方向的方向在脉冲回波场（PEF）中引入振荡。可以利用此方法将流量研究扩展到多维估计。在本文中，TO与平面波（PW）的传输耦合，以在脉冲回波场中具有双向振荡的情况下重建高帧频RF图像。然后，基于2D相位的位移估算器处理此类RF图像，以每秒数千帧的速度生成2D矢量流图。首先，通过改变横向波长，突发长度和传输频率，彻底研究了PW传输后产生TO的能力。与所设计的波长相比，在整个感兴趣的区域内，所产生的横向波长呈现出的偏差和标准偏差为3.3°。 5.7％和10.6 ??模拟和实验分别为7.4％。还通过评估估计速度与预期速度之间的差异来评估超快速矢量流映射方法的性能。仿真和实验均显示，当改变束流角，峰值速度和目标深度时，总体偏差低于20％。还介绍了该方法在颈总动脉和肱动脉上的体内应用。

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