Asymmetry of Doppler spectrum in stenosis differentiation

Med Biol Eng Comput. 1989 Sep;27(5):456-62. doi: 10.1007/BF02441461.


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.

MeSH terms

  • Animals
  • Carotid Artery Diseases / diagnosis*
  • Constriction, Pathologic / diagnosis
  • Dogs
  • Fourier Analysis
  • Mathematical Computing
  • Models, Cardiovascular
  • Models, Structural
  • Signal Processing, Computer-Assisted
  • Spectrum Analysis
  • Ultrasonography*