Abstract
T HE value of radioactive brain scanning in the detection and localization of non-neoplastic intraeranial lesions has been the subject of various publications in recent years. 2'4-6'9 Radioactive mercury (~03) and tile positron emitters Cu 64 and As TM have been the most frequently used radioactive tracers. This report is an analysis of more than 600 brain scans obtained from patients hospitalized for various nontumor conditions (Tables 1 and ~). Whereas Hg 197 was the tracer of choice in the first half of this study, Te 99,,~ perteehnetate was used in the later scans. Technetium 99m 1,~,7,1~ has a very short half-life (61 hours) which allows a tenfold increase in the injected dosage, thus significantly reducing the time of scanning. The total body radiation is comparable to tha t of radioactive mercury. The kidney is not affected. Quinn, et al., s have recently reported their experience with this tracer in 96 consecutive positive scans. I t appeared to us, however, tha t the number of so-called equivocal scans and even of false positive interpretations had increased since we began using Te 9~m for brain scanning. The evaluation of this impression was our primary
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