Cerebrovascular reserve capacity in patients with occlusive cerebrovascular disease: assessment with dynamic susceptibility contrast-enhanced MR imaging and the acetazolamide stimulation test - Guckel, FJ; Brix, G; Schmiedek, P; Piepgras, Z; Becker, G; Kopke, J; Gross, H; Georgi, M (Radiology, 1996)