Smith H J
Acta Radiol Diagn (Stockh). 1984;25(6):535-43.
A duplex scanning system especially intended for abdominal vessel flowmetry was constructed and tested in vitro. An effort was made to mimic the special conditions encountered in the in vivo examination of abdominal vessels. The accuracy of flow estimation in blood-filled plastic tubes was studied with varying blood velocity, flow pattern, diameter of blood-filled tube and placement of sample volume in relation to tube. The influence on flow estimation by flow in a second nearby tube was also tested. The flow estimates performed in a single tube with the Doppler sample volume covering the entire cross-sectional area of the tube, were all within +/- 10 per cent of true flow as long as the velocities were within the working range of the Doppler velocity meter. The error in flow estimation due to a discrepancy in size and placement of sample volume in relation to tube, and the unfavourable influence of flow in a nearby tube, is quantified and discussed.
构建了一种专门用于腹部血管血流测量的双工扫描系统，并在体外进行了测试。努力模拟腹部血管体内检查中遇到的特殊情况。研究了在不同血流速度、血流模式、充血管直径以及样本容积相对于血管的位置等条件下，充有血液的塑料管道中血流估计的准确性。还测试了附近第二根管道中的血流对血流估计的影响。只要速度在多普勒速度计的工作范围内，使用覆盖管道整个横截面积的多普勒样本容积在单根管道中进行的血流估计，均在真实血流的±10%以内。对由于样本容积相对于管道的尺寸和位置差异导致的血流估计误差，以及附近管道中血流的不利影响进行了量化和讨论。
