Background and objective: Hie technique of Doppler tissue imaging (DTl) can provide the real-time information of the direction and velocity of regional wall motion, which gives us a new method for quantitative analysis of myocardial function.

• 背景和目的：多普勒组织成像（DTI）技术可实时显示局部心肌的运动方向和速度，为定量分析心肌功能提供了方便准确的新方法。