在认知不受损的老年人中, perfusion 和 diffusion MRI 度量的临床相关性
Banafsheh Shakibajahromi1, Sudipto Dolui2, Christopher A Brown1
1Department of Neurology, University of Pennsylvania, Philadelphia, PA, USA.
概括
大脑小血管疾病 (CSVD) 影响执行功能 (EF) 早期. 周腹白质 (PVWM) 血流减少与血管风险因素和较差的EF有关,这表明它可能是早期的CSVD生物标志物.
科学领域:
- 神经学 神经学
- 神经成像是一种神经成像.
- 老年学是一门学科.
背景情况:
- 大脑小血管疾病 (CSVD) 是认知能力下降的重要原因,特别影响执行功能 (EF).
- 周周结膜白质 (PVWM) 由于其透率较低,特别容易受到CSVD的影响.
- 早期发现CSVD的表现对于及时干预至关重要.
研究的目的:
- 调查大脑血流 (CBF) 和扩散张力成像 (DTI) 度量在正常出现的白质 (NA-WM) 和NA-PVWM之间的关系.
- 评估这些神经影像标记与血管风险因子 (VRF) 和认知不受损的成年人EF的关联.
- 探索粉胺-β 阴性 (Aβ-) 个体的潜在调解和适度效应.
主要方法:
- 动脉旋转标记 (ASL) MRI 用于测量绝对和相对脑血流 (CBF和rCBF).
- 获得了扩散张力成像 (DTI) 度量,包括平均扩散度 (MD).
- 对101名没有认知障碍的成年人进行了横截面分析,重点是Aβ-受试者.
主要成果:
- 在NA-PVWM和NA-WM之间观察到CBF,rCBF和DTI指标的显著差异.
- 在Aβ-个体中,较低的NA-PVWM rCBF与VRFs相关.
- 在特定的CBF条件下,NA-PVWM rCBF和NA-WM/NA-PVWM MD与EF相关,增加的MD与较差的EF相关.
结论:
- 降低NA-PVWM rCBF与Aβ-个体的VRF和受损EF有关.
- NA-PVWM rCBF可以作为CSVD的早期成像生物标志物,特别是在没有粉样蛋白病理的情况下.
- 这些发现凸显了PVWM对影响认知的早期脑血管变化的敏感性.
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