基于矢量场预估的二维超声弹性成像方法

传统的超声弹性成像方法中以一维弹性超声成像为主，忽略被测体横向位移导致成像效果较差。本研究提出一种基于矢量场预估的准静态二维超声弹性成像方法。首先获取包络线特征峰值指纹信息，采用光流跟踪法对特征指纹进行跟踪并进行矢量场预估；然后根据预估矢量场采用相位相关算法对位移场进行精确计算；通过最小二乘法滤波求取应变场实现准静态二维弹性超声成像。采用有限元分析法对该方法进行有效性验证，对比在泊松比在0．4～0．48范围时该成像方法与其他成像方法的成像效果。实验结果表明，该方法是一种清晰度更高，鲁棒性更好的超声弹性成像方法。

A Two-dimensional(2 D)Ultrasonic Elastography Method based on Vector Field Estimation

In the traditional ultrasonic imaging method,one dimensional elastic ultrasound imaging is the main method,and the lateral displacement of the measured body is neglected.In this paper,a quasi-static 2D ultrasound imaging method based on vector field estimation was proposed.First,the characteristic peak fingerprint informationofenvelope line was gotten,track the information u-sing optical flow tracking method was trached and estimate vector field was predicted;then,the phase correlation algorithm is used to accurately calculate the position of the vector field and predict vector field;filtering to obtain the strain field of quasi static 2D ultra-sound imaging.The validity of the method by using finite element analysis method and compared with the other imaging methods in the Poisson range of 0.4~0.48.The experimental results show that this method is a higher resolution of ultrasound elastography method with better robustness.