title: Efficacy of CW-Doppler and duplex system examinations for the evaluation of extracranial carotid disease.
abstract: The efficacy of different ultrasound methods for the detection of extracranial arterial disease (EAD) was evaluated on the basis of the comparison with angiography. High-resolution B-scan imaging combined with a multigated pulsed Doppler flow pattern analysis (Duplex system) achieved the best results for the detection of morphological and hemodynamic changes of nonstenotic lesions and low grade stenosis. However, a technically unsatisfactory examination rate of 19%, the failure to differentiate between total and subtotal carotid occlusions, underestimation of significant stenosis and impracticable vertebral flow studies were disadvantages of the Duplex technique. CW-Doppler examinations proved to be more precise and more reliable for the detection of significant stenosis and occlusions. Since vertebral blood flow studies were impractical with the Duplex system, CW-Doppler provides more comprehensive information about the hemodynamics of cerebral blood supply.
mesh_terms: D001157:Arterial Occlusive Diseases / Q000175:diagnosis; D002340:Carotid Artery Diseases / Q000175:diagnosis* / Q000000981:diagnostic imaging; D002342:Carotid Artery, External / Q000000981:diagnostic imaging; D003251:Constriction, Pathologic; D006801:Humans; D008722:Methods; D011859:Radiography; D012039:Regional Blood Flow; D014463:Ultrasonography