[Multi-parameter evaluation of cerebral perfusion curves in cerebrovascular diseases results of computer-assisted radionuclide angiography (author's transl)].

The validity of computer-assisted radionuclide angiography was assessed in 189 patients with cerebrovascular disease including TIA (transient ischemic attack), PRIND (prolonged reversible ischemic neurological deficit), completed stroke and a-v. angioma. Time-activity curves were derived from regions of interest established over the right as well as the left side vascular supply territories of both middle and anterior cerebral arteries. Employing Fortran programs, parameters (right to left) A (ratio of maximal count rates), B (ratio of mean count rates) and C (relative perfusion efficiency) were computed. In patients with completed stroke, C revealed 85% and combined evaluation of A and C, 93% correct positive findings as compared with clinical and/or angiographic findings. In patients with asymptomatic stenoses, TIA and PRIND, C revealed an overall sensitivity of 83%, but was correct positive in unilateral extra- and intracranial vascular abnormalities in 96%. Out of seven a-v. angioma, five were diagnosed correctly by parameter C. These high success rates indicate the usefulness of computer-assisted radionuclide angiography (CARNA) supplementary to visual evaluation in patients suspected of having stenoses or occlusion of the major extra- or intracranial cerebral arteries.