首发抑郁症患者静息态功能磁共振低频振幅成像及其差异脑区与攻击行为的关系

目的 通过静息态功能磁共振(fMRI)探讨首发抑郁症患者脑区低频振幅(ALFF)的改变及差异脑区与其攻击行为的关系.方法 选择30例未经治疗或已停药2周的首发抑郁症患者(抑郁症组)和30例性别、年龄、文化程度相匹配的健康志愿者(正常对照)作为研究对象,对所有入选人群进行3.0T静息态功能磁共振扫描,采集血氧水平依赖信号(BOLD)图像,低频振幅(ALFF)技术处理两组BOLD图像,对结果进行两样本t检验,获取差异改变脑区,并提取差异改变脑区的ALFF值与抑郁症攻击行为之间进行相关分析获得相关显著脑区.结果 与正常对照组相比,抑郁症组左侧岛叶、顶叶亚脑回、中央前回,右侧颞上回、中央前回、额下回的ALFF值增高,差异具有统计学意义(P＜0.001,Alphasim校正);而左侧丘脑、楔前叶,右侧枕叶梭状回、舌回脑区的ALFF值减低(P＜0.001,Alphasim校正).相关分析仅发现:抑郁症组ALFF增加的脑区中左侧中央前回与身体攻击、面向自我的攻击和攻击总分正相关(r=0.41、0.49、0.39,P＜0.05或P＜0.01);右侧额下回ALFF值增加与愤怒负相关(r=-0.44,P＜0.05).结论 在静息状态下抑郁症患者大脑部分区域存在自发性神经活动异常,其中额叶有关区域的功能磁共振ALFF增加与攻击行为的发生密切相关.     

重性抑郁症基于低频振幅的静息态功能磁共振成像结果观察

目的 探讨重性抑郁症(MDD)基于低频振幅(ALFF)的静息态功能磁共振成像(fMRI)结果。方法 前瞻性选取2017年1月至2019年1月在本院心理门诊就诊的重性抑郁症患者35例作为MDD组,选择同期在本院进行体检的健康志愿者35例作为对照组。比较两组fMRI不同脑区mALFF值(ALFF值M化处理获得)的不同。结果MDD组患者右侧前额叶皮质、右侧颞上回、右侧颞下回、左侧岛叶、左侧额内侧回、左侧直回的mALFF值较对照组明显升高,差异均有统计学意义(P0.05)。MDD组患者双侧补充运动区、右侧舌回、左侧楔前叶、左侧舌回的mALFF值较对照组明显减低,差异均有统计学意义(P0.05)。结论 MDD患者静息态下右侧前额叶皮质、右侧颞上回、右侧颞下回、左侧岛叶、左侧额内侧回、左侧直回的mALFF值增加,双侧补充运动区、双侧舌回、左侧楔前叶m ALFF值降低,这些脑区神经功能损害可能为引发MDD的基础。     

基于全脑低频振幅的功能磁共振成像青少年抑郁症患者认知功能损害影响因素及机制

目的 研究青少年抑郁症患者认知功能损害的影响因素及影像学机制.方法 纳入2014—2016年于郑州大学第一附属医院精神医学科住院的78例首发未服药青少年抑郁症患者,收集一般人口学资料,以17项汉密尔顿抑郁量表(HAMD-17)因子分评估抑郁症状,采用威斯康星卡片分类测验(WSCT)及连线测验(TMT)评估认知功能,并对...     

阿尔茨海默病不同频段低频振幅静息态功能磁共振成像研究

目的：探讨阿尔茨海默病（AD）患者静息状态下不同频段低频振幅（ALFF）脑功能活动特点。方法使用3.0T磁共振对20例AD患者及20名正常对照者进行脑静息态功能磁共振检查。采用静息态功能磁共振数据处理助手（DPARSF）和静息态功能磁共振数据分析工具包(REST)进行处理及检验统计分析,主要观察Slow-4和Slow-5频率段AD组的脑功能活动特点,用REST软件呈现结果,确定有统计学意义的脑区解剖位置。结果与正常对照组相比,AD患者组ALFF值减低的脑区包括：后扣带回、楔前叶、双侧额叶及双侧顶下小叶（P<0.05）;双侧海马旁回和梭状回、右侧额顶叶、右侧小脑后叶和双侧基底节区的ALFF值则明显升高（P<0.05）;双侧基底节区的自发神经活动对Slow-5频率段更敏感,而较高频率的Slow-4频率段更适合检测出双侧海马旁回及梭状回等脑区自发神经活动的异常。结论 AD患者多个脑区自发神经元活动存在异常,且部分脑区的自发神经元活动存在频率依赖性。     

轻度认知障碍静息态功能磁共振研究低频振幅分析

目的 基于静息态功能磁共振成像（functional magnetic resonance imaging,fMRI）技术,应用低频振荡幅度（amplitude of low-frequency fluctuation,ALFF）观察轻度认知障碍（mild cognitive impairment,MCI）的静息态脑功能改变。方法 选取50例MCI患者作为研究对象,以50例年龄匹配的正常健康老年人作为对照组。所有被试均进行fMRI检查,采取ALFF后处理方法,比较MCI与正常对照组静息态脑功能的差异。结果 与正常对照组比较,MCI组患者双侧海马旁回、双侧尾状核、左侧壳核和左侧岛叶ALFF减弱。未检测出ALFF增强的区域。结论 MCI患者静息态fMRI显示海马旁回等脑区活动强度减弱。     

帕金森病全脑比率低频振幅静息态功能磁共振研究

目的利用静息态功能磁共振比率低频振幅的方法探讨帕金森病可能的病理生理机制及异常的脑功能变化。方法选取本院神经内科2015年7月~2016年10月收治的帕金森病患者22例,并选取22例年龄、性别、受教育程度都与其匹配的健康对照者;对帕金森关期和帕金森开期分别进行静息态功能磁共振扫描,用比率低频振幅算法分析帕金森病患者服药前后脑功能的变化。结果相对于健康对照组,帕金森病关期比率低频振幅值升高的脑区位于双侧颞叶、左侧小脑前叶、左侧枕叶、左侧顶叶及双侧楔前叶等脑区,而比率低频振幅值减少的脑区位于双侧小脑后叶、双侧壳核、右侧额中回等脑区。相对于帕金森病关期,开期时增高的脑区位于左侧枕叶、右侧舌回、左侧小脑前叶、左侧丘脑、左侧运动前回、左侧壳核等脑区,而比率低频振幅值减少的脑区主要位于双侧小脑后叶、左侧额中回、右侧顶下小叶、左侧楔前叶等脑区。PD患者的UP3改善率与PD患者开-关期左侧丘脑的f ALFF差值呈显著的正相关。结论利用比率低频振幅这种算法,我们发现帕金森病患者某些局部脑区相对于健康对照发生了明显变化,这些变化最终导致相关运动环路受损,而有些脑区可能在帕金森病发病过程中起到代偿作用。服用美多芭后对基底节环路具有修饰作用。丘脑作为运动环路的一个重要节点,其f ALFF值变化可以作为反映疾病进展程度的一个标志。     

基于低频振幅算法的难治性癫痫发作间期静息态功能磁共振成像研究

目的 采用功能磁共振成像(functional magnetic resonance imaging,fMRI)探讨难治性癫痫患者发作间期脑功能的改变.方法 对难治性癫痫患者和健康对照的功能磁共振数据均采用低频振荡振幅(amplitude of low frequency fluctuation,ALFF)算法分别进行处理,计算并对比难治性癫痫组相比健康对照组ALFF改变的脑区,分析ALFF改变脑区与病程的相关性.结果 静息状态下难治性癫痫组与对照组相比ALFF值增强的脑区主要有中脑、桥脑、尾状核、额下回及双侧海马旁回、海马等部位;ALFF值减弱的脑区主要有双侧额叶、右侧颞上回、扣带回后部及相邻的楔前叶,且右侧颞中回的ALFF值与病程呈负相关(r=-0.71,P＜0.05).结论 难治性癫痫患者发作间期存在广泛的脑功能异常,且与癫痫病程相关.     

躯体形式障碍脑静息态功能磁共振成像的低频振幅研究

目的 探讨躯体形式障碍脑静息态低频振幅(amplitude of low frequency fluctuation,ALFF)改变特点.方法 纳入21例躯体形式障碍(somatoform disorders,SFD)患者和21例年龄、性别、受教育水平严格匹配的正常对照(normal control,NC),使用3.0T磁共振扫描仪采集T2WI、T1WI结构像及静息态功能像数据.对两组受试者的ALFF map行组内和组间比较,并采用AlphaSim(P＜0.01,体素数＞40)进行多重比较校正.然后提取差异脑区的ALFF值与临床数据进行相关性分析.结果 与NC组比较,SFD组ALFF值增高的脑区有:双侧前额叶、双侧前扣带回;ALFF值减低的脑区有:右侧颞叶颞中回、左侧岛叶、左侧旁中央小叶双侧中央后回.SFD组蒙特利尔认知评估量表(MoCA量表)评分与左侧腹内侧前额叶ALFF值呈显著负相关(r=-0.564,P=0.008),症状自评量表(SCL-90)评分与左侧岛叶ALFF值呈显著负相关(r=-0.505,P=0.020),病程与右侧颞叶ALFF值呈显著负相关(r=-0.514,P=0.017).结论 SFD患者脑静息态神经元自发活动存在广泛改变,这些异常活动可部分阐释躯体形式障碍的神经生理基础.     

阿尔茨海默病的静息态fMRI低频振幅研究

  目的 应用静息态功能磁共振成像(fMRI)低频振幅（(ALFF)方法对阿尔茨海默病(AD) 基线脑活动变化进行研究。 方法　利用GE Signa 3.0T MRI对AD患者组和正常对照组（各18例）分别进行静息态fMRI扫描。应用低频振幅(ALFF)统计方法计算并对比2组ALFF改变的脑区。 结果　静息状态下,AD组患者右侧海马(BA28)及海马旁回(BA36)、左额下回(BA47) 、双侧小脑后叶脑区ALFF值较正常对照组增高,差异有统计学意义( P < 0.001, 未校正);AD组患者楔前叶(BA 7)、后扣带回(BA31) 、左侧丘脑ALFF值较正常对照组减少,差异有统计学意义( P < 0 .001, 未校正)。 结论 AD患者静息态下脑功能区ALFF值产生显著变化。     

难治性精神分裂症患者低频振幅的静息态功能脑影像特点

目的 分析难治性精神分裂症患者和健康被试者在静息状态下脑功能差异,探索精神分裂症脑功能损害的相应脑区。方法 选取2017 年12 月至2020 年12 月杭州市第七人民医院收治的难治性精神分裂症患者32 例,通过宣传的方式在杭州市招募健康被试者27 例。按照有无精神分裂症分为难治性精神分裂症组和健康对照组。难治性精神分裂症组最终纳入28 例,健康对照组27 例。对所有研究对象进行静息状态功能磁共振（fMRI）扫描,采用低频振幅（ALFF）的方法比较两组间的差异脑区。结果 难治性精神分裂症患者组较健康对照组在左侧颞中回、右侧角回、右侧枕中回及左侧枕中ALFF 值升高（P＜0.05）;在右侧舌回及左侧楔前叶ALFF 值降低（P＜0.05）。结论 难治性精神分裂症组患者较健康对照组在静息状态差异脑区出现在颞叶、枕叶及楔前叶等多个脑区,并且存在“默认网络”功能活动异常。     

Abnormal intrinsic brain activity in amnestic mild cognitive impairment revealed by amplitude of low-frequency fluctuation: a resting-state functional magnetic resonance imaging study

Background Previous studies have shown that brain functional activity in the resting state is impaired in Alzheimer's disease (AD) patients.However,alterations in intrinsic brain activity patterns in m...     

Abnormal intrinsic brain activity in amnestic mild cognitive impairment revealed by amplitude of low-frequency fluctuation: a resting-state functional magnetic resonance imaging study

Background Previous studies have shown that brain functional activity in the resting state is impaired in Alzheimer’s disease (AD) patients. However, alterations in intrinsic brain activity patterns in mild cognitive impairment (MCI) patients are poorly understood. This study aimed to explore the differences in regional intrinsic activities throughout the whole brain between aMCI patients and controls.

Methods In the present study, resting-state functional magnetic resonance imaging (fMRI) was performed on 18 amnestic MCI (aMCI) patients, 18 mild AD patients and 20 healthy elderly subjects. And amplitude of low-frequency fluctuation (ALFF) method was used.

Results Compared with healthy elderly subjects, aMCI patients showed decreased ALFF in the right hippocampus and parahippocampal cortex, left lateral temporal cortex, and right ventral medial prefrontal cortex (vMPFC) and increased ALFF in the left temporal-parietal junction (TPJ) and inferior parietal lobule (IPL). Mild AD patients showed decreased ALFF in the left TPJ, posterior IPL (pIPL), and dorsolateral prefrontal cortex compared with aMCI patients. Mild AD patients also had decreased ALFF in the right posterior cingulate cortex, right vMPFC and bilateral dorsal MPFC (dMPFC) compared with healthy elderly subjects.

Conclusions Decreased intrinsic activities in brain regions closely related to episodic memory were found in aMCI and AD patients. Increased TPJ and IPL activity may indicate compensatory mechanisms for loss of memory function in aMCI patients. These findings suggest that the fMRI based on ALFF analysis may provide a useful tool in the study of aMCI patients.

     

抑郁症首发未治疗患者情绪调控环路脑功能网络的静息态功能磁共振研究

Background  Reports on mood regulating circuit (MRC) indicated different activities between depressed patients and healthy controls. The functional networks based on MRC have not been described in major depression disorder (MDD). Both the anterior cingulate cortex (ACC) and thalamus are all the key regions of MRC. This study was to investigate the two functional networks related to ACC and thalamus in MDD.

Methods  Sixteen patients with MDD on first episode which never got any medication and sixteen matched health controls were scanned by 3.0 T functional magnetic resonance imaging (fMRI) during resting-state. The pregenual anterior cingulate cortex (pgACC) was used as seed region to construct the functional network by cortex section. The thalamus was used as seed region to construct the functional network by limbic section. Paired-t tests between-groups were performed for the seed-target correlations based on the individual fisher z-transformed correlation maps by SPM2.

Results  Depressed subjects exhibited significantly great functional connectivity (FC) between pgACC and the parahippocampus gyrus in one cluster (size 923) including left parahippocampus gyrus (–21, –49,7), left parietal lobe (–3, –46, 52) and left frontal lobe (–27, –46, 28). The one cluster (size 962) of increased FC on thalamus network overlapped the precuneus near to right parietal lobe (9, –52,46) and right cingulate gyrus (15, –43, 43) in health controls.

Conclusions  Abnormal functional networks exist in earlier manifestation of MDD related to MRC by both cortex and limbic sections. The increased functional connectivity of pgACC and decreased functional connectivity of thalamus is mainly involved in bias mood processing and cognition.

     

持续性躯体形式疼痛障碍局部一致性脑功能磁共振研究

目的 采用静息态功能磁共振局部一致性(ReHo)技术,观察持续性躯体形式疼痛障碍(PSPD)患者脑局部ReHo值.方法 纳入21例以头痛为主要症状的PSPD患者和17例年龄、性剐相匹配的健康对照者,所有被试者行静息态功能磁共振,对磁共振数据进行分析得到ReHo结果,然后对比PSPD患者组与健康对照组的差异.结果 与健康对照组比较,PSPD患者双侧额叶ReHo值升高,而双侧枕叶、双侧直回、右侧小脑后叶、右侧中央旁小叶、左侧颞中回ReHo值降低(P＜0.01).结论 PSPD患者相关脑区神经元活动一致性存在改变,这种改变可能是导致PSPD患者发病的相关因素之一.     

Decreased regional homogeneity in major depression as revealed by resting-state functional magnetic resonance imaging

Backgroud  Functional imaging studies indicate abnormal activities in cortico-limbic network in depression during either task or resting state. The present work was to explore the abnormal spontaneous activity shown with regional homogeneity (ReHo) in depression by resting-state functional magnetic resonance imaging (fMRI).

Methods  Using fMRI, the differences of regional brain activity were measured in resting state in depressed vs. healthy participants. Sixteen participants firstly diagnosed with major depressive disorder and 16 controls were scanned during resting state. A novel method based on ReHo was used to detect spontaneous hemodynamic responses across the whole brain.

Results  ReHo in the left thalamus, left temporal lobe, left cerebellar posterior lobe, and the bilateral occipital lobe was found to be significantly decreased in depression compared to healthy controls in resting state of depression.

Conclusions  Abnormal spontaneous activity exists in the left thalamus, left temporal lobe, left cerebellar posterior lobe, and the bilateral occipital lobe. And the ReHo may be a potential reference in understanding the distinct brain activity in resting state of depression.

     

基于局部一致性的重度抑郁症患者脑静息态功能磁共振成像研究

目的 采用脑静息态功能磁共振成像(rs-fMRI)局部一致性(ReHo)方法探讨重度抑郁症(MDD)患者脑区自发性活动特征,评价其与抑郁严重程度的相关性.方法 对24例MDD患者和26例相匹配的康对照组(HC)进行rs-fMRI扫描,分析两组ReHo值,将差异显著的脑区内平均ReHo值与HAMD-17评分进行相关性分析.结果 MDD患者较HC组左侧直回、左侧海马、右侧楔前叶、右侧顶上回、左侧顶下缘角回、右侧楔叶ReHo值显著升高;右背外侧前额叶、右侧后扣带回、左侧枕下回、双侧颞下回、右侧颞上回ReHo值降低(P<0.05,Alphasim矫正).Pearson相关分析显示两组差异脑区左侧海马ReHo值与HAMD-17评分呈正相关(r=0.593,P=0.002),右侧后扣带回ReHo值与HAMD-17评分呈负相关(r=-0.431,P=0.035).结论 MDD患者静息态下脑功能损害主要集中于边缘系统及默认网络等多个脑区,且左侧海马与右侧后扣带回局部脑区自发活动的时间同步性与抑郁严重程度存在相关性.ReHo分析可作为抑郁症严重程度评价的潜在生物学标记.