A VELOCITY EVALUATION PHANTOM FOR COLOR AND PULSED DOPPLER INSTRUMENTS

被引:46
作者
RICKEY, DW
RANKIN, R
FENSTER, A
机构
[1] UNIV WESTERN ONTARIO,DEPT MED BIOPHYS,LONDON N6A 3K7,ONTARIO,CANADA
[2] UNIV WESTERN ONTARIO,UNIV HOSP,DEPT RADIOL,LONDON N6A 5A5,ONTARIO,CANADA
基金
英国医学研究理事会;
关键词
DOPPLER ULTRASOUND; VELOCITY EVALUATION; COLOR DOPPLER; PULSED DOPPLER; QUALITY ASSURANCE; WALL FILTER;
D O I
10.1016/0301-5629(92)90088-R
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
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.
引用
收藏
页码:479 / 494
页数:16
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