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British Journal of Radiology (2003) 76, 792-797
© 2003 British Institute of Radiology
doi: 10.1259/bjr/52679856
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Virtual intra-arterial angioscopy (VIA) of the carotid artery based on helical CT data

N Rilinger, MD 1 H Seifarth, MD 5 R Sokiranski, MD 2 S Krämer, MD 5 F Liewald, MD 4 J Goerich, MD 2 A Tomzcak, MD 3 and C E E Nierhoff, MD 1

1 Institute of Diagnostic and Interventional Radiology, Klinikum Offenbach, Starkenburgring 66, 63069 Offenbach, 2 Department of Diagnostic Radiology, University of Ulm, Steinhövelstrasse 9, D-89075 Ulm, 3 Department of Diagnostic Radiology, Kreiskrankenhaus am Plattenwald, Am Plattenwald 1, D-74177 Bad Friedrichshall, 4 Department for Thoracic and Vascular Surgery, University of Ulm, Steinhövelstrasse 9, D-89075 Ulm and 5 Department of Clinical Radiology, University of Münster, A. Schweitzer Straße 33, D-48129 Münster, Germany



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  		Figure 1. Shows the density profile plotted along a line on the cross-sectional image of the latex tube. A straight line of 9 mm length was then overlaid on the density profile. The density level at which the curve is intersected by this 9 mm line corresponds to 56% of maximum density. This value was adopted as the threshold for the patient study.

 


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  		Figure 2. (a) Virtual intra-arterial angioscopy (VIA) and (b) digital subtraction angiography (DSA) of a patient with short segment, high grade stenosis of the internal carotid artery. In VIA this stenosis appears to be an occlusion (*). (• marks the branching off of the external carotid artery.)

 


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  		Figure 3. (a) Virtual intra-arterial angioscopy (VIA) and (b) digital subtraction angiography (DSA) in a not previously treated patient with a long segmental stenosis of the internal carotid artery. In VIA, the internal carotid artery is clearly seen to be narrowed (*). (• marks the branching off of the external carotid artery.)

 


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  		Figure 4. One can recognize a virtual hole in the vessel wall on the right side immediately proximal to the carotid bifurcation, opening a view of the neighbouring jugular vein.

 




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