超声动态向量血流成像的产品化实现

传统超声彩色多普勒成像测量的是血流沿超声传播方向上的速度分量,故无法得到垂直于超声传播方向的血流。向量血流成像是一种更加先进的超声血流成像技术。它不受角度限制,可以直接计算出血流速度的大小和方向。本文总结了现有多种超声向量血流成像技术的特点和发展情况,并从产品化实现的角度分析了各项技术的优缺点。从超声系统发射接收、血流成像、向量速度方向合成、显示等几个方面详述了迈瑞超声向量血流成像技术产品化实现过程中遇到的主要问题及解决方案。实验采用了中科院声学所研制的超声多普勒仿血流体模,通过向量血流成像和脉冲多普勒成像分别测量体模的仿血流速度。将向量血流成像直接计算出来的速度值与脉冲多普勒经过角度校正得到的速度进行对比。在不同条件下,经过多次测量,二者的平均相对误差均在10%以内。

Product realization of ultrasound dynamic vector flow imaging

The conventional ultrasound color Doppler imaging measures the velocity component of the blood flow along the propagation of ultrasound wave, and cannot obtain the flow perpendicular to the ultrasound wave propagation. Vector flow imaging is an advanced ultrasound flow imaging technique, which is angle independent, and can directly calculate the blood flow velocity and its direction. The paper introduces various existed ultrasound vector flow imaging methods, and demonstrated the advantages and disadvantages for the presented methods in terms of commercial implementation. The product realization of vector flow imaging at Mindray has been presented in the paper, where the problems and solutions for ultrasound system transmission and reception, flow imaging, vector velocity angle combination and image display, are detailed. The experiment is made by an ultrasound Doppler blood flow phantom manufactured by the Institute of Acoustics of the Chinese Academy of Sciences. The flow velocity of the Doppler phantom is calculated by the vector flow and pulse wave Doppler imagings, respectively. Results from the two imaging methods are compared, and the average relative errors are within 10%.