...用结构的模态固有频率与特征值间的关系式求出猫里雾罕桥的自然振动频率，并与理论分析及能量频谱图（Energy-Spectrum Frequency）所得之结果互相比较。
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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.
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.
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