超声彩色血流成像系统中一种新的MTI解决方案

A New MTI Scheme in Ultrasonic Color Flow Mapping Systems

在彩色血流成像系统中,超声血流多普勒信号被高强度的组织杂波所污染,M T I是抑制杂波并提取血流信号的一项关键技术。为了进一步提高血流的检测性能,提出了一种新的M T I解决方案,它由预滤波器、杂波弱抑制器和二阶AR估计器三部分组成。经过预滤波和杂波弱抑制处理后,高强度的组织杂波得到有效的削减,此时其强度与血流相当,最有利于发挥二阶AR估计器的性能。仿真实验证实,与传统的方法相比,本文提出的方法能够更加准确和稳定地估计血流参数,同时具有更强的低速血流检测能力。

In color flow imaging systems, the ultrasound Doppler signal scattered from blood is heavily corrupted by the strong clutter signal reflected from the slow-moving muscular tissue. Moving target indicator （MTI） is a key technique of rejecting the clutter signal and detecting blood flow. To improve the performance of detecting blood flow, a new MTI scheme is proposed in this paper. It consists of a pre-filter, a clutter weakrejector and a 2-order AR estimator. After the processing of pre-filtering and clutter weak-rejection, the strong clutter signal is effectively eliminated and its strength is comparable with blood flow. Under such condition, the optimal performance can be attained by the 2-order AR estimator. It is illustrated in the simulation that, compared with the data from traditional methods, the blood flow parameters are estimated with smaller deviation and the lower speed flow is detected.