Cardiac doppler blood-flow signal analysis

Part 1 evaluation of the normality and stationarity of the temporal signal
  • Z. Guo
  • L. -G. Durand
  • L. Allard
  • G. Cloutier
  • H. C. Lee
  • Y. E. Langlois
Physiological Measurement

Abstract

The normality (Gaussian property) and stationarity of the cardiac Doppler blood-flow signal were evaluated on short-time segments distributed over the cardiac cycle. The basic approaches used to perform statistical tests on the nonstationary and quasiperiodic cardiac Doppler signal are presented. The results obtained from the data of ten patients having a normal aortic valve and ten patients having a stenotic valve indicate that a complex Gaussian random process is an acceptable approximation for the clinical cardiac Doppler signal. For segments of 10 ms or less, 82 per cent of them were accepted to be stationary with a significance level of 0.05, whereas for durations greater than 40 ms, the percentage of stationary segments was less than 75 per cent. It was concluded that the 10ms window generally used in practice is a good choice for Doppler spectrogram estimation, but a shorter time interval would be preferable.

Keywords

Aortic valve Doppler ultrasound Normality test Signal processing Stationarity test 

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Copyright information

© IFMBE 1993

Authors and Affiliations

  • Z. Guo
    • 1
    • 2
  • L. -G. Durand
    • 1
  • L. Allard
    • 1
    • 3
  • G. Cloutier
    • 1
  • H. C. Lee
    • 2
  • Y. E. Langlois
    • 3
  1. 1.Biomedical Engineering LaboratoryClinical Research Institute of MontrealMontrealCanada
  2. 2.Department of Electrical EngineeringMcGill UniversityMontrealCanada
  3. 3.Noninvasive Cardiovascular Research LaboratoryHotel-Dieu de Montreal HospitalMontrealCanada

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