Background Previous studies have shown that the functional brain activity in the resting state is impaired in Alzheimer＇s disease （AD） patients. However, most studies focused on the relationship between different b...Background Previous studies have shown that the functional brain activity in the resting state is impaired in Alzheimer＇s disease （AD） patients. However, most studies focused on the relationship between different brain areas, rather than the amplitude or strength of the regional brain activity. The purpose of this study was to explore the functional brain changes in AD patients by measuring the amplitude of the blood oxygenation level dependent （BOLD） functional MRI （fMRI） signals.展开更多
目的:采用静息态功能磁共振成像(resting-state functional MRI,rfMRI)技术,探讨正常人静息态下脑低频振幅(amplitude of low frequency fluctuation,ALFF)的性别差异。方法:对19例男性健康者与19例年龄、受教育程度相匹配的女性健康者...目的:采用静息态功能磁共振成像(resting-state functional MRI,rfMRI)技术,探讨正常人静息态下脑低频振幅(amplitude of low frequency fluctuation,ALFF)的性别差异。方法:对19例男性健康者与19例年龄、受教育程度相匹配的女性健康者进行磁共振静息态扫描,使用ALFF算法对比分析MRI数据,观察男女性血氧水平依赖(blood oxygenation level dependent,BOLD)信号振荡幅度不同的区域。结果:较女性健康组,男性健康组双侧中央前回、双侧额中回、双侧颞上回区域的ALFF值更高;较男性健康组,女性健康组左丘脑、左角回、右海马旁回、后扣带回、脊髓小脑区域的ALFF值更高。结论:静息态下正常人的脑神经活动存在性别差异。展开更多
基金This work was supported by grants from the National Natural Science Foundation of China （No. 30970818）, and the National High-Tech Research and Development Program of China （No. 2008AA02Z302）.
文摘Background Previous studies have shown that the functional brain activity in the resting state is impaired in Alzheimer＇s disease （AD） patients. However, most studies focused on the relationship between different brain areas, rather than the amplitude or strength of the regional brain activity. The purpose of this study was to explore the functional brain changes in AD patients by measuring the amplitude of the blood oxygenation level dependent （BOLD） functional MRI （fMRI） signals.
文摘目的分析静息状态下失眠患者杏仁核与其他脑功能连接的改变。方法失眠患者39例为失眠组,体检健康者23例为对照组,2组均进行临床匹兹堡睡眠质量指数量表(Pittsburgh Sleep Quality Index, PSQI)、汉密尔顿抑郁量表(Hamilton Depression Scale, HAMD)、汉密尔顿焦虑量表(Hamilton Anxiety Scale, HAMA)、世界卫生组织-加利福尼亚听觉词语学习测验(World Health Organization University of California Los Angeles Auditory Verbal Learning Test, WHO-UCLA AVLT)评估睡眠、认知、情绪情况,2组均行磁共振常规扫描和静息态功能MRI扫描(resting-state functional MRI, rs-fMRI),以双侧杏仁核为种子点,比较2组脑功能连接的差异;采用Pearson相关分析失眠组长时记忆评分与左侧杏仁核-左侧海马旁回、左侧杏仁核-右侧海马旁回的功能连接强度的相关性。结果失眠组PSQI[(13.46±2.74)分]、HAMA[(10.10±3.97)分]、HAMD[(9.56±3.48)分]评分及认知障碍评分[(1.23±0.67)分]明显高于对照组[(2.52±1.75)、(1.57±1.90)、(0.78±1.24)、(0.08±0.07)分](P<0.05),WHO-UCLA学习记忆量表中长时记忆[(10.67±2.35)分]和再认记忆[(12.36±2.40)分]评分低于对照组[(11.96±1.85)、(13.39±1.31)分](P<0.05);与对照组比较,失眠组左侧杏仁核与后扣带回、双侧海马旁回、双侧海马、颞叶、舌回和枕叶的功能连接增强(P<0.05),右侧杏仁核与边缘叶、右侧海马旁回、舌回、枕叶、右侧距状皮层、后扣带回、前额叶功能连接增强(P<0.05);失眠组长时记忆评分与左侧杏仁核-左侧海马旁回、左侧杏仁核-右侧海马旁回的功能连接强度呈正相关(r=0.556,P<0.001;r=0.150,P=0.032)。结论失眠患者双侧杏仁核与多个脑区的功能连接出现异常,可能是失眠患者出现情绪调节障碍、认知障碍等的机制之一。
文摘目的:采用静息态功能磁共振成像(resting-state functional MRI,rfMRI)技术,探讨正常人静息态下脑低频振幅(amplitude of low frequency fluctuation,ALFF)的性别差异。方法:对19例男性健康者与19例年龄、受教育程度相匹配的女性健康者进行磁共振静息态扫描,使用ALFF算法对比分析MRI数据,观察男女性血氧水平依赖(blood oxygenation level dependent,BOLD)信号振荡幅度不同的区域。结果:较女性健康组,男性健康组双侧中央前回、双侧额中回、双侧颞上回区域的ALFF值更高;较男性健康组,女性健康组左丘脑、左角回、右海马旁回、后扣带回、脊髓小脑区域的ALFF值更高。结论:静息态下正常人的脑神经活动存在性别差异。
