衰老过程中沿血管周围间隙弥散张量成像分析指数的改变

Changes in diffusion tensor image analysis along the pervascular space index during aging

目的基于沿血管周围间隙弥散张量成像分析(DTI-ALPS),计算DTI-ALPS指数,评估脑类淋巴系统的功能,观察DTI-ALPS指数在衰老过程中的改变,并寻找DTI-ALPS指数与某些可体现思维灵活性的执行功能的相关性。方法使用FSL工具箱提取内森·克莱恩研究所罗克兰数据集内成年志愿者大脑优势半球侧DTI-ALPS指数,分析DTI-ALPS指数分别与年龄和设计流畅性实际准确度之间的相关性,DTI-ALPS指数在不同年龄段上的差异,以及DTI-ALPS指数在年龄和设计流畅性实际准确度之间的中介效应。结果DTI-ALPS指数与年龄成负相关(r=-0.288,P<0.001),但在60~69岁年龄段分组中存在回升的局部高峰(P<0.01);DTI-ALPS指数与设计流畅性实际准确度成正相关(r=0.258,P=0.001);DTI-ALPS指数在年龄和设计流畅性实际准确度之间的中介效应有统计学意义(P<0.05),中介效应占总效应的比例为22.1%。结论衰老过程中DTI-ALPS指数呈总体降低趋势,但是在60~69岁年龄段分组中存在局部回升的高峰,同时,DTI-ALPS指数可能与某些可体现思维灵活性的执行功能相关。

Objective To calculate the diffusion tensor image analysis along the perivascular space(DTI-ALPS)index,evaluate the function of the glymphatic system,observe the changes in the DTI-ALPS index during the aging process,and find the relationship between the DTI-ALPS index and correlates of certain executive functions that reflect mental flexibility,based on DTI-ALPS.Methods The FSL toolbox was used to extract the DTI-ALPS index of the dominant hemisphere of the brain of adult subjects in the NKI Rockland Sample data set,and the correlations between the DTI-ALPS index and age and design fluency practical accuracy were analyzed,respectively.Differences in DTI-ALPS index among different age groups and the mediating effect of DTI-ALPS index between age and design fluency practical accuracy were analyzed.Results The DTI-ALPS index was negatively correlated with age(r=-0.288,P<0.001),but there was a local peak of recovery in the 60-69 age group(P<0.01).The DTI-ALPS index was positively correlated with the design fluency practical accuracy(r=0.258,P=0.001).The mediating effect of DTI-ALPS index between age and design fluency practical accuracy was statistically significant(P<0.05),and the mediating effect accounted for 22.1%of the total effect.Conclusion The DTI-ALPS index showed an overall downward trend during the aging process,but there is a local peak of recovery in the 60-69 age group.At the same time,the DTI-ALPS index might be related to certain executive functions that could reflect thinking flexibility.