Résumé : A prospective brain scanning study using technetium 99m pertechnetate was performed in 84 patients with cerebral infarction. No correlation was found between vascular angiographic findings and the frequency of positive scans. A comparison with clinical motor and mental evaluation showed a good correlation between abnormal scans (58%) and poor initial test results. A half life of 17 days characterized the time course of positive scans according to their density and abnormal radioisotopic uptake area.