观察分析其二维声像图、彩色能量图及脉冲多普勒频谱特征。
The characteristics of the 2 dimensional echogram, the color Doppler energy imaging and pulsed 2 wave Doppler ultrasound spectrum were studied.
用彩色能量图显示低速血流，用脉冲多普勒寻找高舒张期低阻力滋养动脉血流频谱。
The blood flow frequency imaging of peritrophoblastic artery flowing was searching by pulse Doppler, it was high extending flow and low resistance.
目的设计一套数字化脉冲波超声多普勒系统，以实现多深度血流频谱分析和显示。
Objective To design a digital multigated PW ultrasound Doppler system and validate the system in experimental study.
在降雨条件下，多普勒效应后毫米波脉冲频谱发生展宽和压缩。
The spread and compress of millimeter wave pulse frequency spectrum will happen in Doppler Effect during rain.
应用脉冲式多普勒超声心动图检测40例正常儿童肺静脉血流频谱。
Pulsed Deppler echocardiography was used to detect the pulmonary venous flow pattern (PVFP) in 40normal children.
分析了存在距离-速度同步拖引干扰时的信号频谱特征，研究了一种脉冲多普勒（PD）雷达抗距离-速度同步拖引干扰的方法。
The spectrum characteristics of synchronous jamming on range and velocity are analyzed. A method for a PD radar to counter the jamming is also discussed.
彩色多普勒显示病变区呈蓝红相间的彩色血流信号，脉冲多普勒显示连续带状门脉血流频谱。
Pulsed Doppler spectra showed image of smooth continuous bands in the honeycomb or snaky black areas.
目的探讨组织多普勒成像脉冲频谱技术（DTI-PW）评价高血压病、冠心病左室舒张功能。
Objective To explore assessment and distingnishable value on left ventricular diastole function of hypertension and CHD in pulse wave DTI(DTI-PW).
目的探讨组织多普勒成像脉冲频谱技术（DTI-PW）评价高血压病、冠心病左室舒张功能。
Objective To explore assessment and distingnishable value on left ventricular diastole function of hypertension and CHD in pulse wave DTI(DTI-PW).
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