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Related Experiment Videos

Implementation of directional Doppler techniques using a digital signal processor

N Aydin1, D H Evans

  • 1Division of Medical Physics, Faculty of Medicine, Leicester University, UK.

Medical & Biological Engineering & Computing
|July 1, 1994
PubMed
Summary
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Three digital techniques for directional Doppler signals were evaluated: phasing-filter, Weaver receiver, and complex FFT. All methods demonstrated effective real-time performance, with implementation choices depending on specific application needs.

Area of Science:

  • Medical imaging
  • Signal processing
  • Ultrasound technology

Background:

  • Phase quadrature Doppler ultrasound is crucial for directional blood flow measurement.
  • Digital signal processing offers advanced capabilities for analyzing Doppler signals.
  • Existing methods for deriving directional information have limitations.

Purpose of the Study:

  • To describe and compare three digital techniques for deriving directional signals from phase quadrature Doppler data.
  • To evaluate the real-time performance and processing times of these methods.
  • To provide insights for selecting appropriate techniques based on application requirements.

Main Methods:

  • Phasing-filter technique: Digital implementation for directional Doppler signal extraction.

Related Experiment Videos

  • Weaver receiver technique: Digital adaptation for directional Doppler analysis.
  • Complex Fast Fourier Transform (FFT): Application for directional Doppler signal processing.
  • Digital simulations and real-time implementation on a digital signal-processing board.

    • Main Results:

    • All three digital techniques (phasing-filter, Weaver receiver, complex FFT) successfully derive directional signals from phase quadrature Doppler data.
    • Real-time implementation confirmed the efficacy of each method.
    • Comparative analysis of processing times was performed.

    Conclusions:

    • The evaluated digital techniques are effective for directional Doppler signal processing.
    • The choice of technique may depend on factors like the need for time-domain output recording.
    • Further research could explore optimizations for specific clinical applications.