目的探讨室壁与入射超声之间的夹角及应变长度（SL）对长轴方向应变成像（SI）和应变率成像（SRI）的影响。
Objective To study the influence of incidence angle of ultrasound and strain length(SL) on strain imaging(SI) and strain rate imaging(SRI) in long-axis direction.
目的应用速度向量成像(VVI)技术初步探讨脑梗死患者颈总动脉管壁短轴方向运动速度、应变及应变率的特点。
Objective to study the velocity, strain and strain rate of the carotid arterial wall motion using velocity vector imaging (VVI) in cerebral infarction patients.
应变率成像是从组织多普勒显像中衍生出来的新技术，它是一种研究局部心功能的无创的新方法。
Strain rate imaging is a new technique deriving from tissue Doppler imaging, which is a new noninvasive method studying local heart function.
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