自1945年ketty-schmidt 首创N_2O 法以来,40多年间脑循环定量测定取得惊人发展,现在~(133)Xe 吸入法已成为主要的方法。使用这种方法取得的知识也在发展。如在痴呆与脑循环的关系方面积累的资料有:①痴呆患者的脑血流减少,特别是脑血管性痴呆与初老期——老年性痴呆的差别;②灰质与白质血流的差别;③脑局部血流减少的分布不同;④痴呆患者的脑 Since 1945 ketty-schmidt pioneered the N2O method, 40 years of quantitative determination of the cerebral circulation has made astonishing development, and now ~ (133) Xe inhalation has become the main method. Knowledge gained using this method is also evolving. As in the relationship between dementia and cerebral circulation accumulated data are: ① dementia patients with cerebral blood flow reduction, especially in cerebral vascular dementia and early age - senile dementia difference; ② gray matter and white blood flow differences; ③ Brain distribution of local blood flow is different; ④ dementia patients brain