ISSN:
1573-2622
Keywords:
diabetic retinopathy
;
electroretinogram
;
Fourier analysis
;
oscillatory potentials
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Abstract Studying the oscillatory potentials in diabetic retinopathy, the authors experienced several problems interpreting results of digital filtering. The main problem was the separation of the first potential from the a-wave, since their frequencies are within the same range. To improve the procedure of measuring implicit times and of calculating amplitudes, the filtering was started with a finite impulse response filter and followed by a fast Fourier transform. The power of the oscillatory potential was calculated by determining the dominant frequency in the Fourier transformed response and expressed in microwatts. A group of normal subjects was compared with a group of early diabetic retinopathy patients. It appears that even in pathological circumstances a quantitative expression of the oscillatory potential is possible.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00153696
