Estimation of the dynamic carotid flow in patients with normal radionuclide cerebral perfusion.

Radioisotope angioscintigraphy following intravenous injection bolus of 99mTc-pertechnetate was performed in 49 patients with cerebrovascular disturbances. The region of interest placement on the sequential analog images of both middle cerebral and internal carotid arteries and time-activity curves were displayed on the video monitor. In 35 cases of this group we have noticed symmetrical cerebral perfusion and a significant difference between right and left internal carotid flow, and in 33 cases of which dynamic studies were made stenosis or occlusion of the extracranial part of the carotid internal artery was revealed by the X-ray angiography.