Problems of carotid Doppler scanning which can be overcome by using frequency analysis.
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%.
D001157:Arterial Occlusive Diseases / Q000175:diagnosis*; D001783:Blood Flow Velocity; D002340:Carotid Artery Diseases / Q000175:diagnosis*; D002342:Carotid Artery, External / Q000503:physiopathology; D002343:Carotid Artery, Internal / Q000503:physiopathology*; D006801:Humans; D014465:Ultrasonics / Q000295:instrumentation; D014463:Ultrasonography