[Preliminary investigation on dynamic CT scan of intracranial tumors].

74 patients with various intracranial tumors were studied by means of dynamic CT, among them 45 cases were confirmed by operation and pathology. In analyzing the time-density curve and the ratio of increase in CT number of the tumoral tissue to that in the arterial lumens (tissue-blood ratio, TBR), we found that: (1) Dynamic CT technique is safe and easy to perform suitable for out-patients; (2) The time-density curves in acoustic neurinoma, meningioma, glioma and metastatic tumors are different from each other because of difference in vascularity and the degree of B.B.B. breakdown. Meningioma curve shows a rapid rise to the peak followed by a subsequent plateau; (3) TBR at the peak time (TBRp) is useful as an index for tumor. Combined analysis of time-density curve and TBRp is helpful for tumor differentiation.