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Phonoangiography by autocorrelation

R M Rosen, S P Parthasarathy, A F Turner

    Circulation
    |April 1, 1977
    PubMed
    Summary
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    Phonoangiography, a noninvasive method, accurately analyzes carotid artery bruits. This technique shows significant correlation with radiographic angiography findings for stenosis detection.

    Area of Science:

    • Vascular Medicine
    • Medical Acoustics
    • Diagnostic Imaging

    Background:

    • Carotid artery stenosis is a significant risk factor for stroke.
    • Accurate noninvasive diagnostic methods are crucial for patient management.
    • Radiographic angiography, while accurate, is invasive.

    Purpose of the Study:

    • To evaluate the efficacy of phonoangiography as a noninvasive tool for quantitative analysis of carotid artery bruits.
    • To correlate phonoangiographic findings with standard invasive radiographic angiography.
    • To determine the applicability of phonoangiography in patients undergoing head and neck vessel angiography.

    Main Methods:

    • Phonoangiography was performed on 135 patients prior to radiographic angiography.
    • Sound records from 162 carotid arteries were analyzed using a high-speed acoustic analyzer and autocorrelator.

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  • Phonoangiographic diameter predictions were compared with radiographic diameter estimates.

    • Main Results:

    • A correlation coefficient of 0.87 was found between phonoangiographic and radiographic diameter estimates in 18 arteries with carotid stenosis.
    • Phonoangiography identified tortuous vessels in two patients with patent lumens.
    • The method was applicable in approximately one in seven patients requiring head and neck vessel angiography.

    Conclusions:

    • Carotid phonoangiography is a noninvasive technique with significant correlation to angiographic findings.
    • This method shows potential as a screening or adjunctive tool for evaluating carotid artery stenosis.
    • Phonoangiography may reduce the need for invasive angiography in selected patients.