Rickey D W, Rankin R, Fenster A
Imaging Research Laboratories, Robarts Research Institute, London, Ontario, Canada.
Ultrasound Med Biol. 1992;18(5):479-94. doi: 10.1016/0301-5629(92)90088-r.
We describe a phantom designed to evaluate the velocity measurements made with colour and pulsed Doppler instruments. Using a belt to translate a large volume of semi-rigid material through the entire Doppler sample volume eliminates many of the problems associated with flow and string phantoms. A servo-motor with feedback circuitry ensures accurate control of the belt velocity with an uncertainty in the mean velocity of 0.14%. The phantom provides velocities with typical variations of 0.07 cm/s. We have demonstrated the usefulness of this phantom by evaluating the linearity and accuracy of three pulsed Doppler instruments over belt velocities ranging from 0 to 80 cm/s. In addition, the measurements show the effects of the wall filter at low belt velocities. Using this phantom, we have quantified the accuracy, linearity and precision of the velocity measurements made by three colour Doppler instruments. The results also show regions where the colour instruments are aliased and where the wall filter dominates.
我们描述了一种用于评估彩色和脉冲多普勒仪器所进行速度测量的体模。使用一条皮带使大量半刚性材料穿过整个多普勒采样容积，消除了许多与流动和线状体模相关的问题。带有反馈电路的伺服电机可确保对皮带速度进行精确控制，平均速度的不确定度为0.14%。该体模提供的速度典型变化为0.07 cm/s。我们通过评估三台脉冲多普勒仪器在0至80 cm/s皮带速度范围内的线性度和准确性，证明了该体模的实用性。此外，测量结果显示了低皮带速度下壁滤波器的影响。使用该体模，我们对三台彩色多普勒仪器所进行速度测量的准确性、线性度和精密度进行了量化。结果还显示了彩色仪器出现混叠以及壁滤波器起主导作用的区域。
