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Research ArticleBRAIN

Intracranial Stenoocclusive Disease: Double-Detector Helical CT Angiography versus Digital Subtraction Angiography

Bernd Skutta, Günter Fürst, Jan Eilers, Andreas Ferbert and Fritz-Peter Kuhn
American Journal of Neuroradiology May 1999, 20 (5) 791-799;
Bernd Skutta
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Günter Fürst
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Jan Eilers
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Andreas Ferbert
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Fritz-Peter Kuhn
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Abstract

BACKGROUND AND PURPOSE: To our knowledge, no large-scale studies comparing the accuracy of CT angiography (CTA) to intraarterial digital subtraction angiography (DSA) of intracranial stenosis have been reported. We attempted to determine the diagnostic value of intracranial CT angiography (CTA) of normal vasculature and variants as well as of stenoocclusive disease.

METHODS: One-hundred and twelve patients underwent CTA and intraarterial angiography, and 2205 vascular segments were examined to ascertain presence, visibility, and degree of arterial stenoses (n = 105) as well as anatomic variants. Source, maximum intensity projection (MIP), and MIP-generated multiplanar reformatted (MPR) images were evaluated.

RESULTS: All 55 anatomic variants were identified correctly. Visibility of small-vessel segments was increased from 75% to 83% by using source images. MPR was helpful in differentiating distal vertebral hypoplasia from stenosis and in overcoming artifacts. All 43 occlusive segments were graded correctly (sensitivity = 100%, predictive value = 93.4%) as follows: severely stenotic ([n = 23], sensitivity = 78%, predictive value = 81.8%); moderately stenotic ([n = 36], sensitivity = 61%, predictive value = 84.6%); and mildly stenotic ([n = 3], sensitivity = 66%, predictive value = 28%). Normal segments (n = 2100) had a sensitivity of 99.5%, and CTA evinced a specificity of 99% for detecting stenoocclusive disease. Approximately one-third of wrong assessments were related to the petrous segment of the carotid artery.

CONCLUSION: CTA with double-detector technology and advanced postprocessing algorithms, including MPR, is about as reliable as MRA in depicting the vasculature of the anterior and posterior circulation and in grading intracranial stenoocclusive lesions, with the exception of the petrous segment of the carotid artery. CTA might be superior to MRA in the evaluation of poststenotic low-flow segments.

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American Journal of Neuroradiology
Vol. 20, Issue 5
1 May 1999
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Intracranial Stenoocclusive Disease: Double-Detector Helical CT Angiography versus Digital Subtraction Angiography
Bernd Skutta, Günter Fürst, Jan Eilers, Andreas Ferbert, Fritz-Peter Kuhn
American Journal of Neuroradiology May 1999, 20 (5) 791-799;

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Intracranial Stenoocclusive Disease: Double-Detector Helical CT Angiography versus Digital Subtraction Angiography
Bernd Skutta, Günter Fürst, Jan Eilers, Andreas Ferbert, Fritz-Peter Kuhn
American Journal of Neuroradiology May 1999, 20 (5) 791-799;
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