向量血流技术在腹部凸阵超声探头上的应用研究

Application Research of Vector Flow Technique on Convex Array Ultrasonic Probe of Abdomen

向量血流成像是一种新型的超声血流测量技术。相对于传统的彩色多普勒和频谱多普勒,它具有不依赖角度校正、可直接获取血流的实时幅值和方向(血流速度矢量)等优势。横向振荡法(transverse oscillation,TO)是实现向量血流成像的有效方法之一。然而,对于结构更加复杂的凸阵探头,目前仍然缺乏基于商用超声机的完整且详细的算法验证过程。该研究先介绍了TO成像过程和成像原理,然后通过仿真实验,计算设定速度值与测量速度值之间的误差,再通过多普勒体模实验,验证设定速度值与测量速度值之间的误差。其中仿真实验中TO向量血流技术测得的速度值为0.48 m/s,与预设值0.50 m/s的误差为−4%;多普勒体模实验中测得的速度值为8.33、11.14、14.44、16.67 cm/s,与实际速度值7.97、10.78、14.06、17.34 cm/s的误差均在±5%内。2个实验都验证了向量血流技术在腹部凸阵探头上应用的可行性。

Vector flow imaging(VFI)is an innovative ultrasound flow measurement technology.Compared with the traditional color Doppler and spectral Doppler,VFI has the advantages of independence of angle correction and direct acquisition of real-time amplitude and direction of flow.Transverse oscillation(TO)method is one of the effective methods for vector flow imaging.However,a complete and detailed algorithm validation process based on commercial ultrasound machines is still lacking due to more complex convex probes.This study starts with introducing the imaging process and principle of transverse oscillation vector flow technique,and calculates the error between the set velocity value and the measured velocity value through the simulation experiment,and verifies the error between the set velocity value and the measured velocity value through the Doppler flow phantom experiment.Among them,the velocity value measured by the TO vector flow technique in the simulation experiment is 0.48 m/s and the preset value is 0.50 m/s,the error between them is−4%.The velocity values are 8.33,11.14,14.44 and 16.67 cm/s measured by the Doppler flow phantom experiment,the actual velocity values are 7.97,10.78,14.06 and 17.34 cm/s,the errors between them are all within±5%.Both experiments verify the feasibility of using vector flow technique on abdominal convex probe.