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Radiology, Vol 195, 445-449, Copyright © 1995 by Radiological Society of North America
ARTICLES |
DA Katz, MP Marks, SA Napel, PM Bracci and SL Roberts
Department of Radiology, Stanford University Medical Center, CA 94305- 5105, USA.
PURPOSE: To evaluate the use of spiral computed tomographic (CT) angiography in the analysis of the arteries of the circle of Willis and compare these results with magnetic resonance (MR) angiography and conventional angiography. MATERIALS AND METHODS: The results in 17 patients who underwent examination were prospectively studied in a blinded fashion. The presence or absence of the arteries of the circle of Willis was determined by using maximum intensity projection reconstructions from CT angiography and MR angiography. These results were compared with results from conventional angiography. RESULTS: Similar sensitivities were determined for CT angiography (88.5%) and MR angiography (85.5%); however, MR angiography was found to differ significantly (P = .005) from conventional angiography. No significant differences (P > .05) were found between the two modalities and conventional angiography in the detection of the anterior, middle, or posterior cerebral arteries or the anterior communicating artery. CONCLUSION: Spiral CT angiography is highly sensitive in the detection of arterial anatomy in the circle of Willis and is a reliable alternative to MR angiography.
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