The Doppler ultrasound is the most common technique for noninvasive quantification of blood flow, which, in turn, is of major clinical importance for the assessment of the cardiovascular condition. In this article, a method is proposed in which the vessel is imaged in the short axis, which has the advantage of capturing the whole flow profile while measuring the vessel area simultaneously. This view is easier to obtain than the longitudinal image that is currently used in flow velocity estimation, reducing operator dependence. However, the Doppler angle in cross-sectional images is unknown since the vessel wall can no longer be used to estimate the flow direction. The proposed method to estimate the Doppler angle in these images is based on the elliptical intersection between a cylindrical vessel and the ultrasound plane. The parameters of this ellipse (major axis, minor axis, and rotation) are used to estimate the Doppler angle by solving a least-squares problem. Theoretical feasibility was shown in a geometrical model, after which the Doppler angle was estimated in simulated ultrasound images generated in Field II, yielding a mean error within 4°. In vitro , across 15 short-axis measurements with a wide variety of Doppler angles, errors in the flow estimates were below 10%, and in vivo , the average velocities in systole obtained from longitudinal ( ${v}={69}.{1}$ cm/s) and cross-sectional ( ${v}={66}.{5}$ cm/s) acquisitions were in agreement. Further research is required to validate these results on a larger population.

中文翻译：

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角度无关的多普勒多普勒方法估计颈总动脉血流。

多普勒超声是无创定量血流的最常用技术，这反过来对评估心血管疾病具有重要的临床意义。在本文中，提出了一种在短轴上对容器进行成像的方法，该方法的优点是可以在同时测量容器面积的同时捕获整个流量曲线。该视图比当前在流速估计中使用的纵向图像更容易获得，从而减少了操作员的依赖性。然而，由于血管壁不再能够用于估计流动方向，因此横截面图像中的多普勒角是未知的。所提出的估计这些图像中的多普勒角度的方法是基于圆柱状血管和超声平面之间的椭圆相交。该椭圆的参数（长轴，短轴和旋转）用于通过解决最小二乘问题来估计多普勒角度。在几何模型中显示了理论可行性，然后在场II中生成的模拟超声图像中估计了多普勒角，产生了4°以内的平均误差。体外 在具有多种多普勒角度的15个短轴测量中，流量估算误差低于10％，并且 体内 ，从纵向（ $ {v} = {69}。{1} $ cm / s）和横截面（ $ {v} = {66}。{5} $ 厘米/秒）的采集是一致的。需要进一步的研究来验证这些结果在更大的人群上。