| 以傅立叶频谱滤波为手段的振荡电位波形分离方法 |
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| 引用本文： | 袁宁 黎晓新. 以傅立叶频谱滤波为手段的振荡电位波形分离方法[J]. 中国生物医学工程学报, 1993, 12(2): 149-153 |
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| 作者姓名： | 袁宁 黎晓新 |
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| 作者单位： | 中国国际科技促进会北京新技术研究所 北京(袁宁)，北京医科大学人民医院眼科 北京(黎晓新) |
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| 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。
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| 关 键 词： | 振荡电位 傅立叶频谱 波形分离 |
A METHOD FOR SEPARATION OF OSCILLATORYPOTENTIALS FROM ELECTRORETINOGRAMBY FOURIER SPECTRUM FILTRATION |
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| Yuan NingLi Xiao-xin. A METHOD FOR SEPARATION OF OSCILLATORYPOTENTIALS FROM ELECTRORETINOGRAMBY FOURIER SPECTRUM FILTRATION[J]. Chinese Journal of Biomedical Engineering, 1993, 12(2): 149-153 |
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| Authors: | Yuan NingLi Xiao-xin |
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| 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. Thisfrequency 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 inthe high frequency range (80-160 Hz on average ) while the a-& b-wavespectrum located in the low frequency range. By a high-pass filter inthe 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 ofthe a-& b-wave. By the inverse Fourier transformation, the isolatedOPs wavelet and the residual a-& b-wave can be respectively tegainedin the time domain from the frequency domain.As a result, a clear observation and an accurate measurement of theoscillatory potentials are avaiable as well as study of OPs in the frequ-ency domain. |
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| Keywords: | Oscillatory potcntials Fourier analysis Spectrum filtering IsolatedOPs |
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