Title :
A nonstationary signal simulation model for continuous wave and pulsed Doppler ultrasound
Author :
Mo, Larry Y L ; Cobbold, Richard S C
Author_Institution :
Inst. of Biomedical Eng., Toronto Univ., Ont., Canada
Abstract :
A computer simulation model of the nonstationary Doppler ultrasound signals arising from pulsatile blood flow is presented. The model uses sinusoidal components that are modulated by a power spectral density function that varies over the cardiac cycle. An empirical model consisting of two exponential functions is used to represent both the continuous wave and pulsed Doppler power spectral density for normal carotid arteries. It is shown that the spectrogram speckle patterns of the synthesized Doppler signals compare very well with those clinically recorded.<>
Keywords :
Doppler effect; biomedical ultrasonics; blood; digital simulation; haemodynamics; medical computing; cardiac cycle; carotid arteries; computer simulation model; continuous wave; empirical model; nonstationary signal simulation model; power spectral density function; pulsatile blood flow; pulsed Doppler ultrasound; sinusoidal components; spectrogram speckle patterns; Band pass filters; Blood flow; Computational modeling; Computer simulation; Frequency estimation; Nonlinear filters; Signal generators; Signal processing; Signal synthesis; Ultrasonic imaging;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
