The bloodflow frequency spectra of most arteries displayed as triform wave that is high and sharp forward wave ( FW ) in systole and reverse wave ( RW ) in early diastole and small forward wave in late diastole .

大多数动脉的血流频谱 呈 三相波，即收缩期较高尖的前 向波，舒张早期的反向波和舒张中晚期很小的前向波。