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 percent) and poor initial test resutls. A half-life of 17 days characterized the time course of positive scans according to their density and abnormal radioisotopic uptake area.
To compensate for differences in anatomy and magnification, a hand-held programmable calculator remodels the profile of the lateral view of a skull to fit the outline of a reference skull. The statistical analysis of 85 normalized carotid angiograms yeilds a numbered map of supratentorial structures. It is then possible to obtain, within 20 min and without sophisticated equipment, an objective analysis of any new angiogram.
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