Mikkonen R H, Kreula J M, Virkkunen P J
Department of Radiology, University Central Hospital, Helsinki, Finland.
Acta Radiol. 1997 Jul;38(4 Pt 1):598-602. doi: 10.1080/02841859709174392.
To study variation in the process of measuring Doppler ultrasound (US) wave forms.
Eleven radiologists measured peak systolic velocity (PSV), resistance index (RI), and pulsatility index (PI) from a pre-recorded videotape. The wave forms were taken from the carotid, brachial, celiac, and renal interlobar arteries in a healthy volunteer. Each radiologist obtained measurements 10 times from a freely chosen wave form of 10 wave forms (10-beat series) and then a further set of measurements also 10 times from a specific wave form (1-beat series).
There was a significant variation in all the PSV, RI and PI values measured, both in the 1-beat series and in the 10-beat series. The greatest variation was seen in the PI values: up to 5.1-fold. Both intraobserver and interobserver reproducibilities were poor.
The process of obtaining measurements from an identified wave form is a major source of error in Doppler US studies. Special attention should be paid to this final phase of an examination. We recommend that measurements be obtained from more than one heart beat.
研究测量多普勒超声（US）波形过程中的变异性。
11名放射科医生从预先录制的录像带中测量收缩期峰值速度（PSV）、阻力指数（RI）和搏动指数（PI）。这些波形取自一名健康志愿者的颈动脉、肱动脉、腹腔动脉和肾叶间动脉。每位放射科医生从10个波形（10次搏动序列）中自由选择一个波形进行10次测量，然后再从一个特定波形（1次搏动序列）中进行另外10次测量。
在1次搏动序列和10次搏动序列中，所测量的所有PSV、RI和PI值均存在显著差异。PI值的差异最大：高达5.1倍。观察者内和观察者间的重复性均较差。
从已识别波形中获取测量值的过程是多普勒超声研究中误差的主要来源。在检查的这最后阶段应特别注意。我们建议从多个心跳中获取测量值。
