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%.
出处
《中国生物医学工程学报》
EI
CAS
CSCD
北大核心
1992年第4期258-262,共5页
Chinese Journal of Biomedical Engineering
关键词
超声检测
血流速度
频率分离
: Ultrasound
Blood flow velocity
Frequency separation
Down-bandchannel
