Asymmetry of Doppler spectrum in stenosis differentiation.
The asymmetry of the spectral distribution of ultrasonic Doppler flow velocity signals, assessed using the coefficient of skewness, is discussed as a criterion of stenosis differentiation. Its performance is compared with that of the index of turbulence intensity for both in vitro and in vivo flow Doppler signals, recorded distal to a stenosis. The power spectral distributions are computed using the direct Fourier transform and maximum likelihood method. The asymmetry of spectral distribution has proved to be a more efficient criterion than the turbulence intensity. The maximum likelihood method ensures better stenosis differentiation than the direct FFT method.
Kaluzynski
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Tedgui
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D000818:Animals; D002340:Carotid Artery Diseases / Q000175:diagnosis*; D003251:Constriction, Pathologic / Q000175:diagnosis; D004285:Dogs; D005583:Fourier Analysis; D008432:Mathematical Computing; D008955:Models, Cardiovascular; D008961:Models, Structural; D012815:Signal Processing, Computer-Assisted; D013057:Spectrum Analysis; D014463:Ultrasonography