中文摘要：

目的 应用脉冲波/组织多普勒（PW/TDI）双模式技术定量测定多普勒心脏血流速度的低估值,探讨其矫正方法.方法 利用双模式技术同步记录40例健康志愿者主动脉瓣、二尖瓣、三尖瓣、肺动脉瓣跨瓣血流及瓣环组织同方向多普勒运动速度,测量速度并计算低估值.结果 PW/TDI双模式技术可以获得相对于瓣膜的真实血流速度,常规超声多普勒测得的血流速度明显低估了真实的血流速度（P＜0.001）,其中主动脉血流速度被低估（8.5±1.2）％,肺动脉血流速度被低估（6.6±1.1）％,二尖瓣E峰、A峰血流速度分别被低估（13.4±1.7）％、（16.7±3.4）％,三尖瓣E峰、A峰血流速度分别被低估（18.7±1.9）％、（26.0±16.1）％.结论 多普勒超声测量的心脏血流速度明显低估了真实的血流速度,这种低估可以利用PW/TDI双模式技术根据运动相对性基本原理进行定量测定和矫正.

英文摘要：

Objective To quantify the underestimation of cardiac blood flow velocities measured by Doppler echocardiography and to explore a method for correction using a new explored dual PW/TDI technique.Methods The dual PW/DTI mode was used to simultaneously record the aortic,mitral,tricuspid and pulmonary valvular blood flow velocity and the adjacent valvular annulus velocity in forty healthy volunteers,then the underestimations of the flow velocities were calculated.Results The true blood flow velocity relative to the valvular annulus could be obtained by dual PW/TDI technique.Conventional Doppler echocardiographic measurements significantly underestimated the true velocity （ P 〈 0.001）.The actual aortic blood flow velocity had a significant underestimation of （8.5 ± 1.2） %,the actual flow velocity of the pulmonary artery had a significant underestimation of （6.6 ± 1.1） %,the underestimations of E and A wave of mitralvalve＇s were （13.4 ± 1.7）% and （16.7± 3.4）%,the underestimations of E and A wave of tricuspid valve＇ s were （ 18.7 ± 1.9） % and （26.0 ± 16.1 ） %.Conclusions The cardiac blood flow velocity measured by Doppler ultrasound has been significantly underestimated and this underestimation can be quantified and corrected using dual PW/DTI technique based on the principle of motion relativity.