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Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging
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与白质超强度相关的不同功能连接性变化

Alexander F Santillo1, Tor O Strandberg1, Nina H Reislev2

  • 1Department of Clinical Sciences, Clinical Memory Research Unit, Faculty of Medicine, Lund University, Lund/Malmö, Sweden. Postal address: Memory Clinic, Skåne University Hospital, SE-20502 Malmö, Sweden.

NeuroImage
|June 8, 2024
PubMed
概括

与年龄相关的白质过强度会破坏大脑连接和认知功能. 新的机制揭示了与认知衰退相关的额叶连接性增加,影响处理速度和执行功能.

关键词:
认知功能 认知功能扩散磁力共振成像 (MRI) 是一种功能连接性的功能连接性.白质的超强度是白质的超强度.进入的过程中,

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科学领域:

  • 神经成像是一种神经成像.
  • 认知神经科学 认知神经科学
  • 老年学是一门学科.

背景情况:

  • 与年龄相关的白质超强度 (WMH) 是常见的,并与认知能力下降有关.
  • 人们对WMH影响大脑结构,功能和认知的确切机制仍然不完全理解.

研究的目的:

  • 研究白质超强度,结构性和功能性大脑连接,以及非痴呆症个体的认知表现之间的机制联系.
  • 探索与WMH相关的认知障碍的新机制.

主要方法:

  • 分析了465名没有痴呆症的参与者的多模体MRI数据 (FLAIR,DTI,fMRI) (334名认知正常,131名轻度认知障碍).
  • 量化WMH,估计扩散张力成像参数,并计算静态功能连接 (FC).
  • 评估认知功能,包括执行功能和处理速度;使用样本进行检查的功能变化.

主要成果:

  • WMH与结构白质完整性降低和区域间功能连接性降低有关.
  • 减少区域间连接与较差的执行功能和处理速度相关.
  • 此外,WMH还与区域内额叶连接性增加有关,这与认知能力下降和信号度增加有关.

结论:

  • 白物质的超强度通过破坏区域间连接和改变区域内连接影响认知.
  • 额叶功能连接性增加,特点是信号度更高,代表了一个将WMH与认知缺陷联系起来的新机制.
  • 这些发现增强了对白质病变对认知功能的复杂影响的理解,超出了既定的途径.