基于多普勒和散斑跟踪的超声矢量血流成像方法比较

Comparison of ultrasound vector flow imaging based on Doppler and speckle tracking

目的比较基于多普勒方法(Doppler)与散斑跟踪(speckle tracking,ST)的超声矢量血流成像方法性能。方法利用超高速超声平面波成像技术,结合多角度发射,分别基于多普勒与ST算法进行矢量血流成像,通过仿真、仿体、在体实验比较两种成像方法的优劣。结果对于一个仿真血管,基于多普勒和ST的矢量血流成像方法测得水平速度相对偏差分别为3.15%、4.36%,垂直速度相对偏差分别为1.79%、1.00%。两种方法测量偏差接近。最大血流速度100 cm/s的仿体实验中两种方法所测水平速度相对偏差分别为-5.00%、-5.28%,垂直速度偏差分别为0.53、1.46 cm/s,ST方法偏差较大且表现出对峰值速度的低估。在体结果显示ST相比于多普勒方法所测速度偏低。结论仿真中,多普勒与ST方法能够提供准确度相当的矢量血流成像结果;仿体及在体实验中,ST相比于多普勒方法所测速度偏低。

Objective To comparatively evaluate the performance of vector flow imaging based on Doppler and speckle tracking（ ST）. Methods Based on ultrafast ultrasound imaging technique with multiangle plane wave transmission, vector flow imaging was performed using Doppler and ST methods,respectively. Performance of the 2 methods was assessed in simulation,phantom,and in vivo study. Results For a simulated artery,the bias of the horizontal velocity component was 3. 15% and 4. 36% in Doppler and ST methods,respectively. The bias of vertical velocity component was 1. 79% and 1. 00%,respectively. The bias of the 2 methods was similar with each other. In the phantom experiment with the maximal velocity of 100 cm / s,the bias was- 5. 00 % and- 5. 28 %,respectively for the horizontal velocity component,and was0. 53 and 1. 46 cm / s respectively for the vertical velocity component. Blood flow estimated with ST method had relatively larger bias,and the peak velocity appeared to be underestimated. In the in vivo experiments,estimated velocity in ST method was smaller than that in Doppler method. Conclusion In simulation,both Doppler and ST methods can achieve considerably accurate vector flow measurements. In the phantom and in vivo studies,the estimated velocity in ST method was smaller than the velocity in Doppler method.