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Related Experiment Videos

Sample volume misregistration in linear array-based dual beam Doppler ultrasound systems.

Robin Steel1, Peter J Fish

  • 1School of Informatics, University of Wales, Bangor, Bangor LL57 1UT, UK. robin@informatics.bangor.ac.uk

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|August 5, 2003
PubMed
Summary

Dual beam Doppler ultrasound systems can have velocity errors due to sample volume misregistration caused by tissue inhomogeneity. Wider transmit apertures than receive apertures improve accuracy in dual beam velocity estimation.

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Area of Science:

  • Medical imaging
  • Ultrasound technology
  • Biomedical engineering

Background:

  • Dual beam Doppler ultrasound is used for velocity measurement.
  • Left/right sample volume misregistration causes significant velocity estimation errors.
  • Tissue inhomogeneity, such as fat layers, leads to misregistration, especially with small interbeam angles.

Purpose of the Study:

  • To investigate sample volume misregistration in dual beam Doppler ultrasound systems due to tissue inhomogeneity.
  • To analyze the impact of aperture configuration on velocity estimation accuracy.
  • To determine an improved aperture configuration for dual beam velocity estimation.

Main Methods:

  • Calculated angle and translation misregistration for a fat layer inhomogeneity.

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  • Employed a modified time domain approach combining spatial impulse response and ray tracing.
  • Determined complex sample volume sensitivity.

    • Main Results:

    • Investigated the effects of varying aperture sizes and positions on misregistration.
    • Identified that arrangements with wider transmit apertures than receive apertures are preferable.
    • Quantified misregistration effects for a specific system using a single linear array transducer.

    Conclusions:

    • Tissue inhomogeneity significantly impacts dual beam Doppler ultrasound accuracy.
    • Optimizing aperture configuration, specifically using wider transmit apertures, can mitigate velocity estimation errors.
    • The findings provide guidance for designing more accurate ultrasound velocity measurement systems.