Digital signal processing of oscillatory potentials and its clinical application
- VernacularTitle:视网膜电流图振荡电位的计算机处理及临床应
- Author:
Minzhong YU
;
Juan DENG
;
Xiaoling LIANG
;
Dezheng WU
- Publication Type:Journal Article
- Keywords:
oscillatory potentials;
frequency spectra;
diabetic retinopathy;
central retinal vein occlusion;
branch retinal vein occlusion
- From:
Recent Advances in Ophthalmology
2001;21(3):166-169
- CountryChina
- Language:Chinese
-
Abstract:
Objective To study the analyzing method of oscillatory potentials (OPs) and its clinical application.Methods OPs from 40 normal control eyes, 33 eyes (33 cases) with early (0～Ⅱ stage) diabetic retinopathy (DR), 9 eyes (9 cases) with central retinal vein occlusion (CRVO) and 9 eyes (9 cases) with branch retinal vein occlusion (BRVO) were tested. In each OPs waveform, the frequency spectra from 10 to 290 Hz were derived by Fast Fourier Transform (FFT). The sum of power and the maximum power were calculated. The OPs in time domain was re-constructed by counter FFT with the components from 110 to 250 Hz in the frequency spectrum. The latencies, the amplitudes and the sum of amplitudes of wavelets in the re-constructed OPs were measured by the computer.Results Comparing with normal control eyes, in the OPs of early DR, the mean frequency spectra from 140 to 210 Hz were reduced; the sum of power and the maximum power were reduced; the latencies of the four wavelets were prolonged; the amplitudes of the four wavelets and the sum of the amplitudes were attenuated. In the OPs of CRVO, the mean frequency spectra from 150 to 180 Hz were reduced; the sum of power and the maximum power were reduced; the latencies from the first to the third wavelets were prolonged; the amplitudes from the first to the third wavelets and the sum of amplitudes were attenuated. In the OPs of BRVO, the sum of power and the maximum power were reduced; the latencies from the second to the third wavelets were prolonged; the amplitudes from the first to the third wavelets and the sum of amplitudes were attenuated.Conclusion The analysis of OPs in the present study can provide effective and objective indices for diagnosis of DR, CRVO and BRVO.
