[Computerized radionuclide angiography of brain tumors. Analysis of activity-time curves]

43 patients with a cerebral supratentorial tumor and an increased uptake at the static scan underwent intravenous radionuclide angiography with time-activity curve analysis. The increased uptake was evident during radionuclide angiography in about 50% of the cases, 16% during the upslope and 40% during the downslope of the curve. From these data it was concluded that increased uptake in tumours is determined rather than by an increased blood flow by the barrier disruption which may be operative in determining the increased uptake during the first pass in about 40% of the cases. In this case thy typical modification of the curve is characterized by a decreased falling rate of the downslope.