Influence of spectral broadening on continuous wave Doppler ultrasound spectra: a geometric approach.

A model is presented that enables the detailed effects of spectral broadening to be calculated for a continuous wave (CW) Doppler system by using geometric boundary arguments. The model assumes a uniform distribution of isotropic scatterers and treats the transmitter and receiver crystals as incremental sources and receivers. Detailed results for rectangular and circular geometries are presented in order to provide a physical understanding of the manner in which spectral broadening arises. Results are given for the circular geometry, to illustrate the manner in which the received spectrum is affected by the transducer size and distance from the vessel.

[1]  John M. Reid,et al.  Angular Dependence of Scattering of Ultrasound from Blood , 1977, IEEE Transactions on Biomedical Engineering.

[2]  Vernon L. Newhouse,et al.  Analysis of Transit Time Effects on Doppler Flow Measurement , 1976, IEEE Transactions on Biomedical Engineering.

[3]  Resolution performance of Doppler ultrasound flowmeters , 1976 .

[4]  P. S. Green.  Spectral Broadening of Acoustic Reverberation in Doppler‐Shift Fluid Flowmeters , 1964 .

[5]  D H Evans,et al.  Some aspects of the relationship between instantaneous volumetric blood flow and continuous wave Doppler ultrasound recordings--I. The effect of ultrasonic beam width on the output of maximum, mean and RMS frequency processors. , 1982, Ultrasound in medicine & biology.

[6]  P. Veltink,et al.  Influence of Beam Profile and Degree of Insonation on the CW Doppler Ultrasound Spectrum and Mean Velocity , 1983, IEEE Transactions on Sonics and Ultrasonics.

[7]  R. Gramiak,et al.  Cardiovascular Applications of Ultrasound , 1975 .

[8]  V. Newhouse,et al.  Doppler spectral characterization of flow disturbances in the carotid with the Doppler probe at right angles to the vessel axis. , 1985, Ultrasound in medicine & biology.

[9]  L. William Varner,et al.  Geometrical Spectrum Broadening in Ultrasonic Doppler Systems , 1977, IEEE Transactions on Biomedical Engineering.

[10]  E. S. Furgason,et al.  The Dependence of Ultrasound Doppler Bandwidth on Beam Geometry , 1980, IEEE Transactions on Sonics and Ultrasonics.