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APPLICATION OF STFT AND WAVELET TRANSFORM TO OPHTHALMIC ARTERIAL DOPPLER SIGNALS

In this study, short-time Fourier transform and wavelet transform were used for spectral analysis of ophthalmic arterial Doppler signals. Using these spectral analysis methods, the variations in the shape of the Doppler spectra as a function of time were presented in the form of sonograms in order to obtain medical information. These sonograms were then used to compare the applied methods in terms of their frequency resolution and the effects in determination of ophthalmic artery stenosis. Based on the results, performance characteristics of the wavelet transform have been found extremely valuable for spectral analysis of ophthalmic arterial Doppler signals obtained from healthy subjects and unhealthy subjects having artery stenosis.