Theoretical analysis of tissue axial stretching model in elastography  

作　　者：LUOJianwen DINGChuxiong BAIJing HEPing 

机构地区：[1]DepartmentofBiomedicalEngineering,TsinghuaUniversity,Beijing100084,China [2]DepartmentofBiomedical,Industrial,andHumanFactorsEngineering,WrightStateUniversity,Dayton,Ohio45435-0001,USA

出　　处：《Progress in Natural Science:Materials International》2004年第5期430-438,共9页自然科学进展·国际材料（英文版）

基　　金：Supported by the National Natural Science Foundation of China (Grant No. 60171039)

摘　　要：The performance of axial displacement estimation in ultrasound elastography can be degraded by tissue lateral displacements, mainly because of the move-in and move-out of tissue scatterers. In our previous work, a tissue axial stretching model was proposed to separate the decorrelation effect induced by lateral displacements from other decorrelation sources. In this paper, the tissue axial stretching model is analyzed theoretically. The theoretical result in a closed form indicates that the peak value of the cross-correlation function between the pre- and post-compression echoes is determined mainly by the beam width, the beam position and the lateral strain. Computer simulations are carried out to verify the theoretical conclusion. The theoretical analysis and simulation results can help to understand more clearly the decorrelation effect of tissue lateral displacements and the 2-D spatial comprehensive cross-correlation method presented previously to reduce the decorrelation effect.The performance of axial displacement estimation in ultrasound elastography can be degraded by tissue lateral displacements, mainly because of the move-in and move-out of tissue scatterers. In our previous work, a tissue axial stretching model was proposed to separate the decorrelation effect induced by lateral displacements from other decorrelation sources. In this paper, the tissue axial stretching model is analyzed theoretically. The theoretical result in a closed form indicates that the peak value of the cross-correlation function between the pre- and post-compression echoes is determined mainly by the beam width, the beam position and the lateral strain. Computer simulations are carried out to verify the theoretical conclusion. The theoretical analysis and simulation results can help to understand more clearly the decorrelation effect of tissue lateral displacements and the 2-D spatial comprehensive cross-correlation method presented previously to reduce the decorrelation effect.

关 键 词：ELASTOGRAPHY DECORRELATION lateral displacements the cross-correlation function ultrasound. 

分 类 号：O426[理学—声学]