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Related Experiment Videos

Errors and artifacts of Doppler flowmeters and their solution.

K W Johnston, B C Maruzzo, R S Cobbold

    Archives of Surgery (Chicago, Ill. : 1960)
    |November 1, 1977
    PubMed
    Summary

    A new multifilter system improves continuous-wave Doppler ultrasound accuracy for vascular surgeons. This system offers a simple, inexpensive alternative for real-time display of Doppler waveforms and accurate assessment of arterial disease severity.

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    Area of Science:

    • Vascular Surgery
    • Medical Ultrasound
    • Biomedical Engineering

    Background:

    • Continuous-wave Doppler ultrasound flowmeters are crucial for vascular surgeons.
    • Current methods using zero-crossing detectors produce erroneous flow velocity waveforms with artifacts.
    • Accurate quantitative flow velocity measurement is essential for diagnosing arterial disease.

    Purpose of the Study:

    • To introduce a multifilter system as an alternative to zero-crossing detectors for continuous-wave Doppler ultrasound.
    • To evaluate the accuracy and real-time display capabilities of the multifilter system.
    • To assess the correlation between pulsatility index derived from multifilter Doppler waveforms and atherosclerosis severity.

    Main Methods:

    • A multifilter system was developed as a replacement for zero-crossing detectors.

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  • The system allows for real-time display of Doppler waveforms.
  • Pulsatility index was calculated from Doppler waveforms of peripheral arteries in 155 limbs.

    • Main Results:

    • The multifilter system provides a simple, inexpensive alternative to zero-crossing detectors.
    • It enables real-time display of Doppler waveforms, reducing artifacts.
    • Calculated pulsatility index showed an excellent correlation with atherosclerosis severity determined by arteriography.

    Conclusions:

    • The multifilter system significantly improves the accuracy of continuous-wave Doppler ultrasound for quantitative flow velocity measurement.
    • This technology offers a reliable method for real-time assessment of arterial disease severity.
    • The pulsatility index derived from this system is a valuable non-invasive indicator of atherosclerosis.