Value of the Routine Use of the Cerebral Dynamic Radioisotope Study

The results of 1,165 serial dynamic studies were reviewed. The routine addition of the dynamic study to the static image increased the detection of lesions by 33%. In patients with middle cerebral or carotid disease, the number of abnormal studies was doubled. Meningioma, arteriovenous malformation, and middle-cerebral-artery occlusion produced characteristic patterns on the dynamic study. Specific combinations of dynamic study and static image findings increased the certainty of diagnosis. Decreased perfusion was due to cerebrovascular disease eight times more often than to tumor. The combination of normal perfusion and a positive gamma camera image occurred three times as frequently with tumor as with cerebrovascular disease.