title: [Quantification of extracranial carotid stenosis. Magnetic resonance angiography and Doppler sonography versus intra-arterial angiography].
abstract: To assess various non-invasive techniques for quantifying internal carotid artery CA stenosis, per cent luminal diameter reduction on intraarterial angiograms (IAA) was measured in 63 patients with ICA stenosis or occlusion. These data were compared with independent measurements based on MR-angiography, continuous-wave (cw) Doppler ultrasonography, systolic peak flow velocity and colour Doppler assisted duplex imaging. Correlations with IAA were equally strong for MR angiography, cw Doppler and colour Doppler analysis (0.95; 0.92; 0.92). Positive predictive values for > or = 70% ICA stenosis were lower and negative predictive values were higher for cw Doppler (0.85; 0.92) and colour duplex analysis (0.81; 0.94) than for MR angiography (0.86; 0.88). Statistical analysis showed non-linear correlations between percentage of lumen diameter narrowing and the length of the zone of signal intensity loss (0.72) and maximum systolic peak flow velocity (0.77).
  
  
  CONCLUSIONS
  Several non-invasive methods do compare with IAA in identifying and quantifying high-grade ICA stenosis and may suffice for decisions on treatment.
authors.affiliation: Institut für Diagnostische Radiologie, Heinrich-Heine-Universität, Düsseldorf.
authors.forename: G
authors.initials: G
authors.lastname: Fürst
authors.forename: T
authors.initials: T
authors.lastname: Kahn
authors.forename: M
authors.initials: M
authors.lastname: Sitzer
authors.forename: H
authors.initials: H
authors.lastname: Fischer
authors.forename: M
authors.initials: M
authors.lastname: Hofer
authors.forename: T
authors.initials: T
authors.lastname: Fehlings
authors.forename: A
authors.initials: A
authors.lastname: Aulich
authors.forename: H
authors.initials: H
authors.lastname: Steinmetz
mesh_terms: D000328:Adult; D000368:Aged; D002342:Carotid Artery, External / Q000000981:diagnostic imaging; D002343:Carotid Artery, Internal / Q000000981:diagnostic imaging; D016893:Carotid Stenosis / Q000175:diagnosis* / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D011859:Radiography; D012680:Sensitivity and Specificity; D014465:Ultrasonics; D014463:Ultrasonography
vernacular_title: Quantifizierung extrakranieller Karotisstenosen. Magnetresonanzangiographie und Doppler-Sonographie versus intraarterielle Angiographie.