Evaluation of Carotid Stenosis by Phonoangiography

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Abstract
Quantitative spectral (frequency) analyses were performed on 60 carotid bruits in 48 patients with suspected carotid stenosis. The technic was totally noninvasive. Bruits were recorded at the skin surface, analyzed by a minicomputer, and the degree of arterial stenosis estimated using a recently derived theory of sound production by turbulent blood flow. This method has been named phonoangiography.