The result of the research supplies a reference to the design of group delay of BPF in the RF system.
本文的研究结论为射频系统中设计发射机BPF的群时延特性设计提供了参考依据。
The regurgitant volume (RV) and regurgitant fraction (RF) calculated by two dimensional pulsed Doppler (2D-PD) method were served as reference values.
在二维超声心动图上用脉冲多普勒（PD-2D）测量计算反流容积（RV）和反流分数（RF% ）。
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