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DOI: 10.1055/s-2001-12476
© Georg Thieme Verlag Stuttgart · New York
Kontrastverstärkte dreidimensionale MR-Angiographie der A. carotis bei 1,0 Tesla im Vergleich zuri.a. DSA - ist die Methode für die Diagnostik von Karotisstenosen geeignet?
Contrast-Enhanced, Three-dimensional MR Angiography of the Carotid Artery at 1.0 Tesla in Comparison to Intra-Arterial DSA - Is the Method Suitable for Diagnosis of Carotid Artery Disease?Publication History
Publication Date:
31 December 2001 (online)
Zusammenfassung.
Ziel: Überprüfung der Aussagekraft der MR-Angiographie (MRA) der A. carotis bei 1,0 T im Vergleich zur selektiven intraarteriellen digitalen Subtraktionsangiographie (i.a.DSA) und Wertung der Einsatzfähigkeit der Methode in der klinischen Routine bei der Diagnostik von Karotisstenosen. Methoden: 55 Patienten wurden zur Abklärung einer zerebrovaskulären Insuffizienz bzw. Karotisstenose vergleichend mit einer 3D-kontrastverstärkten GRE-Sequenz an einem Mittelfeldsystem (TR/TE 6,2 ± 2,2 ms) und einer selektiven i.a.DSA der Karotiden untersucht. Die Bildanalyse der MRA erfolgte hinsichtlich qualitativer Kriterien, wie Kontrast und venöser Überlagerung. Morphologische Veränderungen wurden für sämtliche Arterien erfasst, wobei Stenosen der A. carotis int. entsprechend den NASCET-Kriterien graduiert wurden. Ergebnisse: Die Sensitivitat und Spezifität der MRA für den Nachweis von höhergradigen Stenosen (> 70 %) und Verschlüssen des extrakraniellen Stromgebietes der A. carotis interna betrugen 97,7 bzw. 94,0 %. Therapierelevante Fehlbeurteilungen beruhten überwiegend auf einer Überschätzung des Stenosegrades. Schlussfolgerung: Die angewendete Methode ermöglicht auch mit einem Mittelfeldsystem eine relativ zuverlässige Beurteilung der Karotisstrombahn. Therapierelevante Befunde sollten jedoch weiterhin mit einer i.a.DSA verifiziert werden, da auch eine geringe Fehlerzahl im Einzelfall von hoher klinischer Bedeutung sein kann.
Contrast-Enhanced, Three-dimensional MR Angiography of the Carotid Artery at 1.0 Tesla in Comparison to Intra-Arterial DSA - Is the Method Suitable for Diagnosis of Carotid Artery Disease?
Purpose: To evaluate the efficacy of three- dimensional, contrast-enhanced magnetic resonance angiography (CE-MRA) of the carotid artery with a 1.0 T system in comparison to intra-arterial conventional angiography (i.a.CA) for the assessment of carotid artery disease. Method: 55 patients with suspected stenosis of the carotid artery were examined with a 3 D-CE gradient-echo sequence on a 1.0 T scanner (TR/TE = 6.2/2.2 ms) and a selective DSA i.a. angiography. Image quality was evaluated by estimating the arterial contrast and venous enhancement. Morphological pathologies were registered for all arteries, stenoses of the internal carotid artery were graded by applying the NASCET criteria. Results: Sensitivity and specificity of MRA in detecting high-grade stenosis (≥ 70 %) and occlusion of the extracranial internal carotid artery were 97.7 and 94.0 %. Therapeutic relevant misinterpretations were mostly based on overestimating the stenoses. Conclusion: The applied CE-MRA technique with a 1.0 T system is suitable for the assessment of carotid artery stenoses. In case of a therapeutically relevant stenosis revealed by MRA, however, verification of the diagnosis by i.a.CA is recommended.
Schlüsselwörter:
MR Angiographie - Gadolinium - Mittelfeldsystem - i.a. DSA - A. carotis - Stenose oder Verschluss
Key words:
MR angiography - Gadolinium - Mid-field equipment - Digital subtraction arteriography - Carotid arteries - Stenosis or occlusion
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Dr. Katja Oberholzer
Klinik für Radiologie
Johannes Gutenberg Universität
Langenbeckstraße 1
55131 Mainz
Phone: + 49-6131-172019
Fax: + 49-6131-176633
Email: oberholz@radiologie.klinik.uni-mainz.de