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.
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