The Performance of an Adaptive Rf-Domain Clutter Removal Filter

  • Peter J. Brands
  • Arnold P. G. Hoeks
  • Robert S. Reneman
Part of the Acoustical Imaging book series (ACIM, volume 22)

Abstract

Ultrasound systems are widely used to visualize in real-time internal structures and blood flow velocity distributions. The latter are estimated from the received ultrasound radio frequency (RF) signals backscattered from moving red blood cells, using a mean frequency estimator. Since RF-signals contain not only scattering, but also reflections, reverberations and noise it is necessary to suppress the power of the reflections and/or reverberations (clutter removal) to estimate the temporal mean frequency of the signal component induced by scattering. Normally this is done with a static high-pass filter acting in the temporal direction with a fixed cut-off frequency. However, by using such a filter the time dependent aspect of the reflections is ignored. A more selective way is to use a band stop filter which adapts its rejection range to the mean frequency of the clutter. A great advantage of this adaptive filter (ADP-f) method is that the rejection range can be kept small.

Keywords

Filtration Expense Autocorrelation Settling Acoustics 

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References

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Copyright information

© Springer Science+Business Media New York 1996

Authors and Affiliations

  • Peter J. Brands
    • 1
  • Arnold P. G. Hoeks
    • 1
  • Robert S. Reneman
    • 1
  1. 1.Department of Biophysics and Physiology Cardiovascular Research Institute MaastrichtUniversity of LimburgMaastrichtThe Netherlands

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