摘要
为克服传统方法(Calliper-square)和带通放大器在测量振荡电位(OPs)中的不足,应用计算机傅立叶频谱滤波技术,从ERG中分离出振荡电位波形。分离出的OPs能够摆脱a-波,b-波对它的影响而独立地表现出来,使得对OPs的测量变得直观、方便、准确,并把对ERG、OPs的研究,从时域分析扩展到频域分析。
<ABSTRACT>
The ERG is a time history function in which the oscillatory poten-
tials (OPs ) is a of higher frequency than those of a-& b-wave. This
frequency differcnce can be utilized to separate the OPs from the a-&
b-wave in the frequency domain by the Foutier spectrum filtration.
After Fourier transformation of the ERG (processed in the PATH-
FINDER I, Nicolet Co. USA ),the OPs spectrum was found to exist in
the high frequency range (80-160 Hz on average ) while the a-& b-wave
spectrum located in the low frequency range. By a high-pass filter in
the frequency domain, the OPs spectrum can be filtered out and isola-
ted from the a-& b-wave spectrum. Meanwhile the residual component,
which can alse be filtered out by a low-pass filter,was the spectrum of
the a-& b-wave. By the inverse Fourier transformation, the isolated
OPs wavelet and the residual a-& b-wave can be respectively tegained
in the time domain from the frequency domain.
As a result, a clear observation and an accurate measurement of the
oscillatory potentials are avaiable as well as study of OPs in the frequ-
ency domain.
出处
《中国生物医学工程学报》
EI
CAS
CSCD
北大核心
1993年第2期149-153,共5页
Chinese Journal of Biomedical Engineering
关键词
振荡电位
傅立叶频谱
波形分离
Oscillatory potcntials
Fourier analysis
Spectrum filtering
IsolatedOPs
