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  • Title: Problems of carotid Doppler scanning which can be overcome by using frequency analysis.
    Author: Johnston KW, Brown PM, Kassam M.
    Journal: Stroke; 1982; 13(5):660-6. PubMed ID: 7123600.
    Abstract:
    The value of the concomittant use of a real time frequency analyzer along with a continuous wave carotid Doppler scanner is demonstrated in this study of 118 cases. With a colour-coded Doppler scanner alone, internal carotid stenoses greater than 35% were diagnosed with a sensitivity of 95% and a specificity of 82%. With the addition of frequency analysis certain inherent problems with Doppler scanning were overcome and with the measurement of the peak Doppler frequency, the specificity was improved to 93%.
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