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Related Experiment Videos

Effect of frequency dependent processes on pulsed Doppler sample volume.

P J Fish1, J A Cope

  • 1School of Electronic Engineering Science, University of Wales-Bangor, UK.

Ultrasonics
|July 1, 1991
PubMed
Summary
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Frequency-dependent ultrasound attenuation and scatter alter Doppler signal spectra. This study reveals these processes, along with velocity dispersion, also change the pulsed Doppler sample volume shape and position.

Area of Science:

  • Medical Imaging
  • Ultrasound Physics
  • Biomedical Engineering

Background:

  • Ultrasound pulse spectrum changes due to frequency-dependent attenuation and scatter affect Doppler signals from blood flow.
  • These spectral alterations are well-documented for flow parallel to the ultrasound beam.

Purpose of the Study:

  • To investigate how changes in ultrasound pulse shape and velocity dispersion impact the pulsed Doppler sample volume.
  • To determine the combined effect of frequency-dependent attenuation, scatter, and Kramers-Kronig related velocity dispersion on Doppler measurements.

Main Methods:

  • Analysis of ultrasound pulse spectrum changes due to frequency-dependent attenuation and scatter.
  • Incorporation of velocity dispersion effects, linked via Kramers-Kronig relations.

Related Experiment Videos

  • Modeling the resulting alterations in the pulsed Doppler sample volume characteristics.

    • Main Results:

    • Frequency-dependent attenuation and scatter modify the ultrasound pulse spectrum.
    • Velocity dispersion, linked to attenuation by Kramers-Kronig relations, accompanies spectral changes.
    • These combined effects lead to modifications in the shape and position of the pulsed Doppler sample volume.

    Conclusions:

    • The study demonstrates that ultrasound pulse spectrum changes, pulse shape alterations, and velocity dispersion collectively modify the pulsed Doppler sample volume.
    • Understanding these effects is crucial for accurate interpretation of Doppler ultrasound measurements in blood flow assessment.
    • This research highlights the complex interplay of physical phenomena influencing Doppler signal acquisition and analysis.