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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Three-dimensional vector flow estimation using two transducers andspectral width
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Three-dimensional vector flow estimation using two transducers andspectral width

机译：使用两个换能器和光谱宽度的三维矢量流估计

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摘要

Current ultrasonic blood flow measurement systems estimate onlynthat component of flow which is parallel to the incident ultrasoundnbeam. This is done by relating the mean backscattered frequency shift tonthe axial velocity component through the classical Doppler equation. Annumber of ultrasonic techniques for estimating the two-dimensional (2D)nblood velocity vector have been published, both Doppler and non-Doppler.nSeveral three-dimensional (3D) blood velocity vector techniques havenalso been proposed, all of which require a multiplicity of transducersnor lines of sight. Here a technique is described for estimating thentotal velocity vector, using only two transducers. This is achieved bynmeasuring not only the frequency shifts but also the bandwidths of thenbackscattered spectra, making use of the fact that the bandwidth of anDoppler spectrum has been shown to be proportional to the velocityncomponent normal to the sound beam. Partial experimental verification ofnthe proposed vector flow estimation scheme is demonstrated by using anconstant velocity thread phantom
机译：当前的超声血流测量系统仅估计平行于入射超声束的那部分流。这是通过经典多普勒方程将平均反向散射频移与轴向速度分量相关联来完成的。已经发布了许多用于估计二维（2D）n血流速度矢量的超声技术，包括多普勒和非多普勒技术.n还已经提出了几种三维（3D）血流速度矢量技术，所有这些都需要多个换能器。视线。这里描述了一种仅使用两个传感器来估算总速度矢量的技术。这是通过不仅测量频移而且还测量了后向散射频谱的带宽来实现的，这要利用一个事实，即多普勒频谱的带宽已经显示出与垂直于声束的速度分量成正比。利用等速线体模论证了本文提出的矢量流估计方案的部分实验验证。

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