摘要
背景:低频波动振幅(ALFF)作为一种潜在的脑成像生物标志物,已被用于区分阿尔茨海默病(AD)和失忆性轻度认知障碍(aMCI)患者与正常对照(NC)患者。然而,目前尚不清楚ALFF改变的频率依赖模式是否能有效区分疾病的不同阶段。 方法:本研究共纳入AD患者52例,aMCI患者50例,NC患者43例。ALFF值在以下三个频段进行计算:classical (0.01-0.08 Hz), slow-4 (0.027-0.073 Hz), slow-5 (0.01-0.027 Hz)。随后,以局部功能异常为特征,采用支持向量机(SVM)检测AD、aMCI和NC的分类效果。 结果:我们发现ALFF在不同频带的组间差异主要位于左侧海马(HP)、右侧海马(HP)、双侧扣带回(PCC)和双侧楔前叶(PCu)、左侧角回(AG)和左侧内侧前额叶皮层(mPFC)。当以局部功能异常为特征时,我们发现ALFF在slow-5频段区分三组的准确率最高。 结论:这些发现可能加深我们对AD发病机制的认识,提示slow-5频带可能有助于探讨AD的发病机制和分期。
关键词: 阿尔茨海默病,失忆性轻度认知障碍,静息状态功能性磁共振成像,低频波动幅度,slow-5频带,支持向量机
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