一种避免下边带通道的频率分离型双向Doppler定量测量血流速度方法  

A FREQUENCY DOMAIN QUANTITATIVE MEASUREMENTMETHOD FOR BLOOD FLOW VELOCITY WITHBIDIRECTIONAL DOPPLER ULTRASOUNDAVOIDING DOWN-BAND CHANNEL

作　　者：王威琪[1] 邵谦明[1] 

机构地区：[1]复旦大学电子工程系

出　　处：《中国生物医学工程学报》1992年第4期258-262,共5页Chinese Journal of Biomedical Engineering

摘　　要：本文报道一种频域双向定量测量血流速度的新方法。它采用Doppler效应。在原理上由于使用双声束可以避免两种不同的边带滤波器而简化为只用一种上边带滤波器。文中还叙述了使用查表方法消除夹角效应的影响以及cosθ再校正后使输出更精确。最后还给出了它的实验结果。<ABSTRACT> The up-band signal of the second ultrasonic beam contained reverse component of blood flow. Using double ultrasonic beam, bidirectional Doppler ultrasound can avoid the use of two kinds of band filters and be simplified into a single kind of band filter. In order to make the ou- tput to be more accurate, the influence of angle effect can be overco- me by the Table-out method and another special method called cosθRe correction. The experiment result is that when the deviation angle vary from -18 to + 20 the relative error of output is less than 5%.

关 键 词：超声检测 血流速度 频率分离 

分 类 号：R331.3[医药卫生—人体生理学]