射频信号上的快速弹性成像位移估计方法

摘要

Objective To improve the vejocity of radio frequency(RF) signal based displacement estimation method for ultrasonic elastograph.Methods By analyzing the property of overlap between the displacement estimator windows, a new efficient method of displacement estimate method has been designed.A 60 mm× 50 mm tissue model was simulated with one round hard inclusions of 20 mm diameter uniformty distributed along the tissue central axial line.and its elasticity modulus were 10 times of the background.Results In the simulated experiment, the average displacement estimate time of the conventional method and the new method were(166.52±63.32) seconds and (74.13±4.30) seconds, respectively.The latter was obviously lower.Conclusion The experiment shows that the new method could generate same displacement data and same ultrasound elastography as the convetional method and need less runtimes.%目的 提高射频(RF)信号上的超声弹性成像位移估计速度.方法 利用弹性成像位移估计窗口的重叠特征,设计快速的互相关位移估计方法.通过仿真内含一硬包容物的组织(60 mm×50 mm),包容物直径为20 mm,且均匀分布在中轴线上,其弹性模量为背景10倍的体模弹性成像实验验证新方法 的效果.结果 在体模弹性成像实验中新方法 的位移估计平均时间[(74.13±4.30)s]比传统方法 [(166.52±63.32)s]低.结论 使用新方法 不仅能产生与传统方法 一致的位移和弹性图像,还具有较低的时间复杂度优势.