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A computer controlled flow phantom for generation of physiological Doppler waveforms.

P R Hoskins1, T Anderson, W N McDicken

  • 1Department of Medical Physics and Medical Engineering, Royal Infirmary, Edinburgh, UK.

Physics in Medicine and Biology
|November 1, 1989
PubMed
Summary
This summary is machine-generated.

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This study introduces a novel flow phantom capable of generating physiological Doppler waveforms. The system uses a microcomputer for precise control, enabling easy adjustments to waveform shape and flow rate for accurate Doppler signal simulation.

Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Fluid Dynamics

Background:

  • Accurate simulation of physiological blood flow is crucial for Doppler ultrasound research and development.
  • Existing flow phantoms often lack the flexibility to replicate complex, physiological Doppler waveforms.
  • The need for a controllable and reproducible flow phantom for Doppler waveform generation is significant.

Purpose of the Study:

  • To describe the design and function of a novel flow phantom for generating physiological Doppler waveforms.
  • To demonstrate the capability of microcomputer control for adjusting waveform shape and mean flow.
  • To validate the accuracy of the generated Doppler waveforms against control waveforms.

Main Methods:

  • A gear pump, driven by a stepping motor controlled by a BBC microcomputer, propels a suspension of scattering particles (Sephadex in glycerol) as artificial blood.

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  • Waveform shapes are selected from a digital library, allowing for easy modification of flow characteristics.
  • Reflections causing waveform distortion were minimized by strategically reducing tubing diameter near the phantom's end.

    • Main Results:

    • The microcomputer control system effectively allowed for easy alteration of waveform shape and mean flow.
    • The use of specific tubing configurations largely eliminated waveform distortions from end reflections.
    • Generated Doppler waveforms showed good agreement with control waveforms across a broad spectrum of pulsatility.

    Conclusions:

    • The developed flow phantom provides a flexible and accurate platform for generating physiological Doppler waveforms.
    • Microcomputer control enhances the utility of the phantom for research requiring variable flow conditions.
    • This system offers a valuable tool for testing and validating Doppler ultrasound equipment and techniques.