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Neuroradiology |
1 From the Imaging Research Laboratories, John P Robarts Research Institute, PO Box 5015, 100 Perth Drive, London, Ontario, N6A 5K8 Canada (D.G.N., A.C., T.Y.L.); Dept of Radiology and Lawson Research Institute, St Joseph's Health Centre, London, Ontario (A.C., J.D.B., R.K., T.Y.L.); Dept of Anaesthesia (R.A.C., A.W.G.), London Health Sciences Centre, University Campus, Ontario; and Dept of Neurology, Westfälische Wilhelms-Universität, Munster, Germany (D.G.N.). Received Aug 26, 1998; revision requested Oct 22; final revision received Jan 14, 1999; accepted Feb 15. Supported in part by Medical Research Council of Canada, Heart and Stroke Foundation of Canada, and GE Medical Systems. D.G.N. supported by a research grant of the Deutsche Forschungsgemeinschaft. Address reprint requests to T.Y.L. (e-mail: tlee@irus.rri.on.ca).
PURPOSE: To validate a dynamic single-section computed tomographic (CT) method to measure cerebral blood volume (CBV) and cerebral blood flow (CBF) by using a noncarotid artery as the input and to demonstrate the feasibility of this method in a pilot series of patients.
MATERIALS AND METHODS: Twelve dynamic contrast material–enhanced CT studies were performed in beagles. CBV, CBF, and mean transit time (MTT) values were calculated by using an internal carotid artery (ICA) and a noncarotid artery as the input artery to the brain. Patient studies with use of the radial artery as the input were performed (a) repetitively in two patients after subarachnoid hemorrhage, (b) in a patient with a symptomatic ICA occlusion before and after the intravenous injection of 1 g of acetazolamide, and (c) in a patient with a malignant brain tumor.
RESULTS: Linear regression analyses revealed highly significant correlations (P < .001) between CBV (r, 0.98; slope, 0.96), CBF (r, 0.89; slope, 0.87), and MTT (r, 0.80; slope, 0.76) values calculated with the ICA and the noncarotid inputs. The CT-derived patient data correlated well with ancillary clinical and neuroradiologic findings.
CONCLUSION: Dynamic single-section CT scanning to measure CBV and CBF on the basis of a noncarotid input is a highly accessible and cost-effective blood flow measurement technique.
Index terms: Blood vessels, stenosis or obstruction, 17.72 • Brain, blood flow, 10.919 • Brain, CT, 10.12113, 10.12115 • Brain, hemorrhage, 10.2521 • Brain, perfusion, 10.919 • Cerebral blood vessels, flow dynamics, 17.12112, 17.919 • Computed tomography (CT), perfusion study, 10.919
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