评估白质中的微观结构变化,老化中的高强度和通过高级扩散MRI揭示的轻度认知障碍
Maurizio Bergamino1, Megan R Nelson1,2, Elizabeth Keeling1,2
1Division of Neuroimaging Research, Barrow Neurological Institute, Phoenix, AZ, USA.
Journal of Alzheimer's disease reports
|November 21, 2025
概括
先进的扩散核磁共振 (dMRI) 揭示了老年人白质超强度 (WMHs) 的广泛微观结构变化. 这些变化,特别是在轻度认知障碍 (MCI) 中,与认知表现相关,这表明dMRI是认知衰退的生物标志物.
科学领域:
- 神经成像是一种神经成像.
- 放射学 放射学是一门学科.
- 神经学 神经学
背景情况:
- 白质超强度 (WMHs) 在老年人中很普遍,与衰老和认知能力下降有关.
- WMHs与脱髓化,轴突损伤和血管变化有关,可以通过MRI检测到.
- 它们在正常衰老和轻度认知障碍 (MCI) 中都被观察到.
研究的目的:
- 调查先进扩散MRI (dMRI) 是否可以检测MCI患者与对照人群相比WMH的微观结构差异.
- 评估这些微观结构测量和认知表现之间的关系.
主要方法:
- 使用先进的dMRI技术 (自由水扩散张力成像和扩散形成像) 对来自ADNI数据库的参与者 (55个正常衰老,46个MCI).
- 自动识别WMH及其周围半阴影.
- 评估了微观结构特征及其与认知表现的关联 (迷你精神状态检查).
主要成果:
- 在WMH中,比正常的白质物体,自由水度更高,分数异性质和曲解度较低,这表明白质物体的变化广泛.
- 在相应的组织类型中,没有发现有意义的小组微观结构差异.
- 在MCI组中,WMHs中的kurtosis指标与认知表现相关.
结论:
- 先进的dMRI揭示了WMHs内部复杂的微观结构变化.
- 这些发现表明,先进的dMRI生物标志物可以为白质变化在认知衰退中的作用提供宝贵的见解.
- dMRI可能是了解WMHs对衰老和认知的影响的有用工具.
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