title: [Analysis of wavelet scalogram of blood flow ultrasonic Doppler signal].
abstract: OBJECTIVE
  To study the power spectrum density of blood flow ultrasonic Doppler signal using wavelet analysis.
  
  
  METHODS
  Doppler signal of blood flow in human common carotid artery was studied with wavelet scalogram analysis, an affine smoothing Wigner-Ville transform with a constant "Q" character.
  
  
  RESULTS
  Wavelet scalogram of blood flow ultrasonic signal had a higher distinguishability than STFT spectrogram in the low frequency portion, but had poorer decussation terms than spectrogram.
  
  
  CONCLUSIONS
  It is practicable to estimate the spectrum of Doppler signals of blood flow by the wavelet analysis method. And this can be used in low speed blood flow for higher resolution of spectrum in the low frequency portion.
authors.affiliation: Research Institute of Telemetry Aerial Tec. co., Beijing, China.
authors.forename: P
authors.initials: P
authors.lastname: Zhang
authors.forename: Y
authors.initials: Y
authors.lastname: Liu
authors.forename: Z Y
authors.initials: ZY
authors.lastname: Liu
authors.forename: Y
authors.initials: Y
authors.lastname: Shen
authors.forename: J H
authors.initials: JH
authors.lastname: Yu
mesh_terms: D000337:Aerospace Medicine; D001783:Blood Flow Velocity; D017536:Carotid Artery, Common / Q000000981:diagnostic imaging* / Q000502:physiology; D005583:Fourier Analysis; D006801:Humans; D018608:Ultrasonography, Doppler