Abstract:
:Both carotid bifurcations were examined in 353 patients over a 20-month interval using a combination of real-time and pulsed Doppler ultrasound (duplex scanning). Angiographic correlation was available in 72 cases. Stenosis of the internal carotid was evaluated using a Doppler input frequency of 5 MHz and a scan angle of 60 degrees. A peak frequency shift of less than 3.5 kHz was found to be a sign of less than or equal to 30% stenosis; 3.5-4 kHz with moderate turbulence suggested 31-50% stenosis, 4-8 kHz 51-90% stenosis, and greater than 8 kHz greater than 90% stenosis. Subtotal stenosis (greater than 95%) was manifested by a frequency shift of less than 8 kHz, but the waveform was totally distorted. Overall accuracy improved from 77% for the first 6 months to 87% for the last 14 months. For stenosis greater than 50%, sensitivity improved from 82% to 97% during this period. Analysis of errors and suggestions for avoiding them are presented.
journal_name
Radiologyjournal_title
Radiologyauthors
Jacobs NM,Grant EG,Schellinger D,Byrd MC,Richardson JD,Cohan SLdoi
10.1148/radiology.154.2.3880910subject
Has Abstractpub_date
1985-02-01 00:00:00pages
385-91issue
2eissn
0033-8419issn
1527-1315journal_volume
154pub_type
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