J Cereb Blood Flow Metab:脑小血管病患者正常白质的T2弛豫时间与认知状态有关

2021-06-28 MedSci原创 MedSci原创

NAWM的T2弛豫时间似乎对病理性微结构组织改变高度敏感,与SVD认知功能障碍的发展相关,尽管潜在的微结构和病理生理异常仍有一定的推测性。

脑小血管病(SVD)是缺血性脑卒中的重要病因之一,也是导致血管性认知功能障碍和血管性痴呆的主要原因。在常规磁共振成像(MRI)数据上表现SVD的影像学表现中,T2加权和液体衰减反转恢复(FLAIR)图像上观察到的不同程度的白质高信号(WMH)通常是主要表现。WMH的体积和病变的进展与认知障碍或认知能力下降有关。然而,效应被证明是相对较小的,表明WMH体积解释了认知状态的适度横截面变异。以往的弥散张量成像(DTI)研究表明,正常白质(NAWM)的微结构完整性受损与脑小血管病(SVD)的认知功能障碍有关。 Alexander Seiler等探讨了定量T2弛豫测定法是否是评价SVD患者认知异常相关组织改变的合适影像学生物标志物。 39例患者和18例年龄匹配的健康对照者进行了3T磁共振成像(MRI)和综合认知功能评估。在NAWM中测定平均定量T2、分数各向异性(FA)和平均扩散率(MD),并与控制年龄、标准化脑容量、白质高强度容量和其他常规SVD标记的认知参数相关。 组织分割和图像分析图解。(a)FLAIR图像,用于WMH的分割。(b)覆盖WMH mask(红色区域)和NAWM mask(蓝色

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    2021-08-26 guojianrong
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    2021-11-07 一闲
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