Scenium软件研究不同性别正常人脑葡萄糖代谢随年龄变化的规律

摘要

Purpose To analyze the PET image of normal human brain by using Scenium software, so as to ifnd out the change of cerebral glucose metabolism with different age and gender. Materials and Methods Brain PET imaging data of 493 healthy males and 273 healthy females were collected in the study. The subjects were divided into 6 groups according to age:21-30 years group,31-40 years group, 41-50 years group, 51-60 years group, 61-70 years group and 71-82 years group. Each group was further subdivided according to gender. The brain areas were automatically outlined by Scenium and the mean standard uptake value (SUV) of each brain area was calculated and compared among groups. Results Most cerebral glucose metabolism of males at different age was significantly different (F=2.580-5.316, P<0.05), except temporal lobe in right side and cerebellum showed no difference (F=1.611-1.935, P>0.05); whilst difference in cerebral glucose metabolism of females at different age was not signiifcant (F=0.721-1.706, P>0.05). In male groups, cerebral glucose metabolism got peak at 31-40 years, and decreased signiifcantly at 51-60 years mainly involving areas like cinglulate gyrus, calcarine and surrounding cortex;and the groups after 61 years showed no signiifcant decrease. In female groups, cerebral glucose metabolism got peak at 31-40 years and showed no significant decrease along with age. Conclusion Cerebral glucose metabolism decreases unevenly after 40 years old. It drops significantly in males at 51-60 years whilst that in females is not obvious.%目的：应用Scenium软件分析正常人脑PET图像，研究不同性别人脑葡萄糖代谢随年龄变化的规律。资料与方法收集493例男性和273例女性健康体检者的脑PET图像，按年龄将不同性别体检者分为21~30岁组、31~40岁组、41~50岁组、51~60岁组、61~70岁组、71~82岁组。应用Scenium软件对所得脑PET图像进行归一化并勾画脑区，获得各脑区标准摄取值（SUV）的平均值，比较不同性别及不同年龄组间各脑区葡萄糖代谢水平的差异。结果男性不同年龄组间多数脑区葡萄糖代谢差异有统计学意义（F=2.580~5.316, P<0.05），仅右侧内侧颞叶和小脑差异无统计学意义（F=1.611~1.935, P>0.05）；而女性不同年龄组间各脑区葡萄糖代谢差异无统计学意义（F=0.721~1.706, P>0.05）。男性31~40岁组脑代谢水平达到最高峰，51~60岁组脑代谢水平降低最明显，降低区以扣带回、距状裂及周围皮质最显著；而61岁以后脑代谢水平趋于稳定。女性31~40岁组脑代谢水平有显著的高峰，其后随年龄增加，脑代谢无明显降低。结论正常人脑葡萄糖代谢40岁以后随年龄增加呈非匀速性下降趋势，男性随年龄增加脑功能代谢降低较明显，51~60岁时最为显著，而女性随年龄增加脑功能代谢降低不明显。