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Related Experiment Videos

Does transducer selection affect aortic arch velocities?

N Wilson, S J Goldberg, H D Allen

    American Heart Journal
    |April 1, 1987
    PubMed
    Summary
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    Different Doppler transducer types impact ascending aortic (AAo) velocity measurements. Off-axis transducers provided similar results, while on-axis imaging yielded lower peak and mean AAo velocities.

    Area of Science:

    • Cardiovascular Imaging
    • Medical Ultrasound
    • Hemodynamics

    Background:

    • Accurate measurement of blood flow velocities in the aorta is crucial for diagnosing various cardiovascular conditions.
    • Doppler echocardiography is a primary tool for assessing aortic velocities, but transducer selection may influence results.

    Purpose of the Study:

    • To evaluate the effect of different Doppler transducer types and orientations on ascending aortic (AAo) and descending aortic (DAo) velocity measurements.
    • To compare velocities obtained from the AAo with those from the DAo.

    Main Methods:

    • Velocity measurements were performed in 28 healthy individuals using four different transducers for the AAo and one for the DAo.
    • Transducers included nonimaging, angled continuous wave, and various imaging probes with different Doppler transmission angles relative to the transducer handle.

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    Main Results:

    • Transducers transmitting Doppler signals off-axis showed similar mean and peak AAo velocities.
    • An imaging transducer transmitting Doppler along the transducer handle axis produced significantly lower velocities due to imaging limitations.
    • Mean DAo velocity was comparable to mean AAo velocity, but with greater variability.

    Conclusions:

    • Transducer orientation significantly affects AAo velocity measurements, with off-axis transmission being more reliable.
    • On-axis imaging poses challenges for accurate AAo velocity assessment.
    • DAo velocity can be a comparable, though more variable, surrogate for AAo mean velocity.