东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2014, Vol. 35 ›› Issue (7): 917-921.DOI: 10.12068/j.issn.1005-3026.2014.07.002

• 信息与控制 • 上一篇    下一篇

基于二维压缩扩展和光流法的组织应变估计方法

张耀楠1,2，李宏亮1,2，郑海荣3，康雁1,2   

  1. (1 东北大学 中荷生物医学与信息工程学院， 辽宁 沈阳110819; 2 东北大学 教育部医学影像计算重点实验室， 辽宁 沈阳110819; 3 中国科学院深圳先进技术研究院 生物医学与健康工程研究所， 广东 深圳518055)
  • 收稿日期:2013-08-23 修回日期:2013-08-23 出版日期:2014-07-15 发布日期:2014-04-11
  • 通讯作者: 张耀楠
  • 作者简介:张耀楠(1962-)，男，江苏如皋人，东北大学教授;康雁(1964-)，男，辽宁沈阳人，东北大学教授，博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(61372014);辽宁省自然科学基金资助项目(201202071).

Strain Estimation Method Based on 2D Companding and Optical Flow

ZHANG Yaonan1,2， LI Hongliang1,2， ZHENG Hairong3， KANG Yan1,2   

  1. 1 School of SinoDutch Biomedical and Information Engineering， Northeastern University， Shenyang 110819， China; 2 Key Laboratory for Medical Image Computing， Ministry of Education， Northeastern University， Shenyang 110819， China; 3 Institute of Biomedical and Health Engineering， Shenzhen Institutes of Advanced Technology， Chinese Academy of Science， Shenzhen 518055， China.
  • Received:2013-08-23 Revised:2013-08-23 Online:2014-07-15 Published:2014-04-11
  • Contact: ZHANG Yaonan
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摘要： 在超声弹性成像中，为了得到大压缩量下的精确应变估计，要考虑组织横向膨胀带来的横向位移的信号去相关影响，为此提出了结合二维压缩扩展和光流法的组织应变估计方法.首先采用二维希尔伯特变换法将原始超声RF信号通过包络检测的方法转换为解析信号，再利用块匹配算法得到16个子区域的位移矢量，然后利用线性回归方法从位移矢量估计出二维压缩扩展的参数.在完成二维压缩扩展之后，再利用光流法对微小位移进行精确估计.实验结果表明，二维压缩扩展方法和光流法的结合增加了总体应变估计的精度与鲁棒性.所得纵向位移和纵向应变与有限元仿真结果基本一致，证明了所提算法的正确性.

关键词: 超声, 弹性成像, 光流法, 二维压缩扩展, 应变估计

Abstract: In order to get accurate strain estimation in ultrasound elastography， it is important to eliminate the decorrelation caused by the lateral displacement of the longitudinal compression. A new strain estimation method was proposed by combining the twodimensional companding and optical flow method. First， the twodimensional Hibert transformation was used to convert the original ultrasound RF signals to the analytical signals by the envelop detection. Then， the block matching method was used to get the motion vectors of 16 subblocks. Based on the motion vectors， a linear regression method was used to estimate the parameters of the twodimensional companding. After the twodimensional companding， the optical flow method was employed to estimate the subpixel motion. Experimental results showed that the overall strain estimation accuracy and robustness could be enhanced by the proposed twodimensional companding methods. The longitudinal displacement and longitudinal strain obtained by the proposed method were basically consistent with those obtained by the finite element simulation， which proved the correctness of the new method.

Key words: ultrasound, elastography, optical flow method, 2D companding, strain estimation

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