Detection of tumor blood flow within the spectrum, recorded peak systolic velocity (PSV) and resistance index (RI).

检测肿瘤内部的血流频谱，记录收缩期峰值流速(PSV)和阻力指数(RI)。

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Objective This paper is to investigate the ratio of the systolic peak value and the end-diastolic velocity of blood flow (S/D value) and its clinical value, which can predict fetal anoxia.

目的探讨脐动脉收缩期血流峰值（S）与舒张末期血流速度（D）的比值（S/D）对预测胎儿宫内缺氧的临床价值。

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