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目的探讨一般人群生理状态下各种脑血管形态学类型所占比例、性别比等。方法连续性抽取正常MRA图像计1081份定义为一般人群生理状态下的脑血管形态学类型,按颈内动脉供血范围及Willis环发育情况进行分型,分析各种类型发生情况。结果一侧A1优势型与非一侧A1优势型性别构成无统计学意义(x2=1.6274 P=0.2024),左右侧性别构成无统计学意义(x2=3.5353 P=0.0601)。左侧A1优势型发生率(121/164)与右侧A1优势型发生率(43/164)存在显著性差异(u=6.09,P<0.001),左侧发生率明显高于右侧发生率。前循环优势型与非前循环优势型无性别侧别构成差异(x2=0.6285,P=0.4279),在性别构成上存在显著性差异(x2=30.1706,P<0.001),前循环优势型更亦发生在女性。一侧A1优势型合并前循环优势与非一侧A1优势型发生前循环优势发生率无统计学意义(x2=0.1254,P=0.7233)。生理状态下标准均衡型MRA完整Willis环显示率较低。结论 MRA是一种无创、有效的评价生理状态脑血管类型的方法,利用MRA评价生理状态下脑血管类型可以为其他与脑血管类型有关疾病提供正常对照。
Objective To investigate the proportion of various types of cerebrovascular morphology in the general population under physiological conditions, sex ratio and so on. Methods A total of 1081 consecutive MRA images were defined as cerebrovascular morphological types in the general population, and were classified according to the range of internal carotid artery blood supply and the development of Willis rings. The incidence of various types was analyzed. Results There was no statistically significant difference between A1 dominant and non-dominant A1 genotypes (x2 = 1.6274 P = 0.2024). There was no significant difference between the left and right genders (x2 = 3.5353 P = 0.0601). There was a significant difference in the prevalence of A1 dominant type (121/164) on the left and the dominant type A1 on the right (43/164) (u = 6.09, P <0.001). The incidence of the left side was significantly higher than that of the right side . There were significant differences in sex composition (x2 = 30.1706, P <0.001) between the former and the latter non-sex side (x2 = 0.6285, P = 0.4279) Occurs in women. There was no significant difference in the preponderance of circulatory dominance between A1 predominant pre-combination and A1 non-predominance (x2 = 0.1254, P = 0.7233). Physiological state of standard MRA intact Willis ring display rate is low. Conclusion MRA is a noninvasive and effective method to evaluate cerebrovascular types in physiological status. Using MRA to evaluate cerebrovascular types in physiological status can provide a normal control for other cerebrovascular related diseases.