利用先验估计自适应加窗的准静态超声弹性成像位移估计算法

发布时间：2018-04-18 01:21

  本文选题：弹性成像 + 先验估计　； 参考：《声学学报》2016年05期

【摘要】：准静态弹性成像技术是基于组织压缩前和压缩后超声回波射频信号进行组织运动重构的弹性成像技术。提出了一种基于先验估计的自适应窗函数算法,在位移估计过程中,使用已估计的临近窗的时延值作为先验信息,自动调整截取压缩后射频信号段的截取窗函数,提高了互相关运算所需的压缩前和压缩后信号段之间的相关性。仿真实验结果表明,该算法不仅大大提高了成像速度,而且提高了信噪比较低时的成像质量,同时该算法具有更宽的应变通带。
[Abstract]:The quasi-static elastic imaging technique is an elastic imaging technique based on the radio-frequency signals of ultrasonic echo before and after tissue compression for tissue motion reconstruction.In this paper, an adaptive window function algorithm based on prior estimation is proposed. In the process of displacement estimation, the estimated time delay of the adjacent window is used as the prior information to automatically adjust the intercepting window function of the truncated RF signal segment.The correlation between pre-compression and post-compression signals required for cross-correlation operation is improved.The simulation results show that the algorithm not only improves the imaging speed, but also improves the imaging quality when the signal-to-noise ratio is low. At the same time, the algorithm has wider strain-pass band.
【作者单位】： 近代声学教育部重点实验室南京大学声学研究所;
【基金】：国家重点基础研究发展计划(2012CB921504) 国家自然科学基金(11274166) 声场声信息国家重实验室开放课题(SKLA201609)资助
【分类号】：TB559;TN911.7
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本文编号：1766164