Circulation, Vol 64, 1191-1195, Copyright © 1981 by American Heart Association
G Fell, DJ Phillips, PM Chikos, JD Harley, BL Thiele and DE Strandness Jr
The duplex ultrasonic scanner combines real-time B-mode imaging with a
single-gate, variable-range pulsed Doppler. The detection and
categorization of the severity of carotid artery atherosclerosis is
achieved by performing spectral analysis of the pulsed Doppler velocity
signal obtained from vessels of interest. Using this technique, 750
patients with suspected extracranial carotid artery disease were evaluated
between January 1978 and January 1980. One hundred thirty- five of these
750 patients (18%) underwent cerebral arteriography performed with biplanar
views of the carotid bifurcation. The degree of stenosis was measured
independently in these patients and was available for comparison with the
results of duplex scanning and spectral analysis. Duplex scanning correctly
detected the presence of disease in 252 of 259 carotid arteries studied
(97%). The extent of involvement varied from plaques that produced less
than 10% diameter reduction to those that resulted in a total occlusion.
The technique was less accurate with lesions that produced less than 10%
diameter reduction.
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