年轻人和老年人之间在DTI测量白质完整性的全球和通道特定差异
Stephanie Matijevic1, Lee Ryan1,2
1Department of Psychology, University of Arizona, Tucson, AZ, United States.
Frontiers in aging neuroscience
|June 16, 2025
概括
衰老使大脑通道的白质完整性均质化,增加了扩散张力成像 (DTI) 中的共享差异,比如分数异形性 (FA) 和扩散性. 这种总体效应伴随着白质健康的特定与年龄相关的变化.
科学领域:
- 神经成像是一种神经成像.
- 神经科学是一个神经科学.
- 衰老研究研究 衰老研究
背景情况:
- 随着年龄的增长,大脑白质的微观结构完整性下降.
- 扩散张力成像 (DTI) 测量中的与年龄相关的变化可能在白质道上有所不同.
- 全球衰老效应可能会使白质完整性均化,从而增加整个区域的共享变异.
研究的目的:
- 为了调查衰老是否会增加白质通道的共享变异.
- 检查与年龄相关的白质变化的管道特异性变异性.
- 为了比较年轻人和老年人之间的36个白质区域的DTI测量.
主要方法:
- 扩散张力成像 (DTI) 数据来自71名年轻 (18-37岁) 和129名年长 (52-82岁) 的成年人.
- 概率学曲道学用于重建,关联和辐射通道.
- 分数异构 (FA),平均扩散率 (MD),辐射扩散率 (RD) 和轴向扩散率 (AD) 测量值为每个通道.
主要成果:
- 与年轻人相比,老年人对DTI措施的通道间相关性更强.
- 对于FA,RD和AD的一般因素解释了老年人中更多的共享变异.
- 年长的成年人在大多数区域都有较低的FA和较高的MD/RD,效果强度各不相同.
- 在阿尔茨海默病中,年龄组之间的差异更为可变.
结论:
- 老龄化似乎对白质的完整性产生了全球性的,同质化的影响.
- 白质完整性的特定于管道的年龄相关变化也会发生.
- 研究结果支持老化对白质的影响的双重模式:全球同质化和通道特定的变化.
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