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)。

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

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结果表明观察组脑底动脉收缩期峰值血流速度明显高于正常对照组，差异非常显著（P＜0．01）；

The result showed that systolic peak velocity of bottom cerebral arteries in heroin addicts was much higher than that of the normal control group (P<0.01).

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通过对椎动脉收缩期切迹组与无切迹组做束臂试验，比较束臂前后收缩期血流速度下降幅度及流速自下降至恢复的时间。

Compare the decline in blood flow velocities and its recovery time before and after Trousseau's test in vertebral waveform with or without notch at systole.

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