抑郁症首次发病患者静息态脑功能局部一致性的研究

目的 利用功能磁共振(fMRI)和局部一致性(regional homogeneity,ReHo)探讨抑郁症首次发病(以下简称首发)患者在静息态脑功能是否存在异常及异常部位.方法 对34例符合美国精神疾病诊断与统计手册第4版诊断标准的首发抑郁症患者(抑郁症组)和34名性别、年龄、文化程度匹配的健康志愿者(对照组)进行静息态fMRI扫描.结果 抑郁症组静息态脑血氧水平依赖信号的ReHo高于对照组的脑区有左侧额叶眶回、顶下小叶、颞上回,右侧额内侧回、顶下小叶、小脑后叶;低于对照组的脑区有左颞下回、右颞上同和胼胝体、双侧后扣带回(P＜0.005,K≥10).结论首发抑郁症患者在静息态存在多个腩区功能活动的异常,并可能和抑郁症的病理机制有关.     

腰背痛患者静息态fMRI的脑功能局部一致性研究

目的 利用功能磁共振成像(fMRI)技术探讨静息状态下腰背痛患者脑局部一致性(ReHo)变化的特点. 方法 选择自2011年8月至2012年1月南方医科大学珠江医院康复医学科招募的15例年龄、性别和文化程度相近的健康者作为受试者,向其右侧腰背部肌肉注射0.3 mL30g/L的高渗盐水制造腰背痛模型,采用3.0T MR仪分别在注射前、注射后进行静息状态fMRI扫描,所得数据进行配对t检验,比较疼痛及非疼痛状态下静息态脑功能的局部一致性差异. 结果 与正常状态相比,腰背痛受试者ReHo增高的脑区有:双侧前额叶内侧、左额下回、右额中回、右小脑扁桃体、右脑桥、右岛叶、右尾状核、右楔前叶、右海马旁回、后扣带回;ReHo减低的脑区有:右颞上回、左颞中回、左中央前回、左中央后回、左海马旁回、左梭状回、左前扣带回、左顶上小叶、右顶下小叶(P＜0.005,体素值≥10). 结论 静息状态下腰背痛患者部分脑区存在脑活动区域一致性异常.     

抑郁症与正常人静息态脑功能变化对照研究

目的:利用功能磁共振成像(functional magnetic resonance imaging,fMRI)技术,研究静息状态下重性抑郁症患者经抗抑郁药治疗前后脑局部一致性变化的特点. 方法:20例重性抑郁症患者(抑郁症组),以20名在性别、年龄、受教育年限均与之相匹配的健康人作为对照(对照组),在抗抑郁治疗前和治疗10周进行静息状态fMRI扫描. 结果:与治疗前比较,抑郁症组治疗后大脑左侧黑质、左额中回(BA9,BA10)、左额内侧回(BA10)、左颞中回(BA21)、右额中回(BA11)、右额内侧回(BA25)、右额下回(BA45)及右颞上回(BA38)局部一致性减低.与对照组比较,抑郁症组治疗前双侧楔前叶(BA7)局部一致性增高,而治疗后右前扣带回腹侧(BA31)、右额下回(BA46)、右额内侧回(BAIO)及左海马旁回(BA36)局部一致性减低. 结论:静息状态下抑郁症患者存在部分脑功能异常,经抗抑郁治疗后可逆转.     

青少年广泛性焦虑障碍患者静息态功能磁共振成像研究

目的:运用局部一致性(ReHo)方法研究首发青少年广泛性焦虑障碍患者的局部自发性脑活动. 方法:对19例首发青少年广泛性焦虑障碍患者及14名年龄、性别与其相匹配的正常对照进行静息态脑功能磁共振成像扫描,通过计算每个给定体素与其最邻近的26个体素之间的肯德尔和谐系数(KCC)来获得全脑的局部一致性(ReHo)图,利用双样本t检验分析两组受试者静息态下局部一致性的差异. 结果:与正常对照相比,青少年广泛性焦虑障碍患者局部一致性降低的脑区包括双侧额中回、枕中回,左侧额上回、颞下回、前扣带回及右侧顶下回、枕下回(P ＜0.005,未校正);局部一致性增高的脑区包括:右侧楔前叶、角回及左侧枕上回(P ＜0.005,未校正). 结论:青少年广泛性焦虑障碍患者静息态脑功能局部一致性存在异常.     

以妄想为主的男性精神分裂症患者脑局部一致性的功能磁共振研究

目的：探讨男性偏执型精神分裂症患者在静息状态下是否存在脑功能活动异常及其区域。方法：采用病例一对照研究方法,对20例以妄想为主的男性精神分裂症患者（患者组）和20名性别、年龄、受教育程度相匹配的正常对照者（正常对照组）进行功能磁共振成像（fMRI）扫描,分析静息状态下各脑区的局部一致性（regionalhomogeneity,ReHo）的差异。结果：设P〈0．05、体素范围（k值）≥85,与正常对照组比较,患者组双侧额上回、双侧颞中回、左额中回、左中央前回、左小脑脚和右扣带回局部一致性（ReHo值）减低,右颞上回和左颞下回ReHo值增高,而左梭状回ReHo值既有增高也有减低。结论：以妄想为主的男性精神分裂症患者在静息状态下可能存在广泛分布的脑区功能异常。     

精神分裂症首次发病未治疗患者静息态下局部脑区自发活动的研究

目的探讨精神分裂症首次发病未治疗患者静息态下局部脑区自发活动的情况:方法:利用低频振幅(ALFF)方法,对27例首次发病未治疗的精神分裂症患者(患者组)进行静息状态下功能磁共振(fMRI)扫描,对影像学数据进行ALFF方法处理,结果与22名年龄、性别及受教育程度相匹配的健康对照者(正常对照组)比较。结果:与正常对照组相比,患者组ALFF显著增高的脑区是运动前区、辅助运动区和眶额回;ALFF显著降低的脑区是楔前叶、后扣带回、内侧前额叶和角回(P0.05,Alphaism矫正)。结论:精神分裂症首次发病未治疗患者在静息态下运动前区、辅助运动区、眶额回、楔前叶、后扣带回、内侧前额叶和角回的局部脑区自发活动异常,这些异常脑区可能有助于解释精神分裂症的病理机制。     

难治性抑郁症脑局部葡萄糖代谢的初步研究

目的 探索难治性抑郁症的脑局部葡萄糖代谢模式.方法 对符合国际疾病分类标准第10版(ICD.10)抑郁症诊断标准的8例难治性抑郁症患者和8名正常对照进行静息态正电子发射计算机断层/18F-氟代脱氧葡萄糖(PET/FDG)扫描,利用参数统计图(SPM2)方法分析组间脑局部代谢差异.结果 患者组的双侧额中回、左侧眶额皮质、左顶下小叶、左腹侧前扣带回、右侧额下回、右颞是回和颞中回以及双侧背侧前扣带回FDG代谢水平明显低于对照组;而左侧中央前/后回、右侧额内侧回、右颞极、右岛叶以及双侧小脑等脑区代谢水平则明显高于对照组.上述差异均有统计学意义(P<0.005).结论 难治性抑郁症患者存在旁边缘系统代谢增高和皮质代谢降低的交互性改变的异常代谢模式.     

首发未用药精神分裂症患者静息态脑功能局部一致性fMRI研究

目的 通过功能磁共振(functional magnetic resonance imaging,fMRI)技术,探讨首发未用药精神分裂症患者静息状态下脑局部自发神经元活动特征.方法 采用3.0T功能磁共振成像技术检测13例首次发病且未用药的男性精神分裂症患者与13名年龄和受教育年限相匹配的健康男性静息状态下全脑的活动情况.使用SPM8、REST软件结合局部一致性(regional homogeneity,ReHo)方法对影像学数据进行分析.结果 与对照组相比,患者组ReHo降低的脑区为右侧额上回和左侧丘脑,ReHo增高的脑区是右侧颞中回,差异均有统计学意义(P＜0.05).结论 本研究中首发未用药精神分裂症患者存在静息态额叶、颞叶、丘脑功能活动局部一致性异常,ReHo异常可能有助于更好地理解精神分裂症病理机制.     

首发抑郁障碍患者及抑郁易感者静息态脑功能磁共振的研究

目的:探讨首发抑郁障碍患者及抑郁易感者静息态下脑功能,探索抑郁症发病及抑郁易感的病理生理学机制。方法:采用静息态功能磁共振成像技术(rs-fMRI)对23例首发未服药抑郁障碍患者、26例抑郁易感者和15例健康志愿者行rs-fMRI扫描,应用局部一致性分析方法(ReHo)比较各组间的差异脑区。结果:相对正常组,患者组右额上回、双侧前扣带回ReHo值升高,右壳核、小脑后叶及颞上回ReHo值降低;易感组左壳核及右前扣带回ReHo值升高,左舌回、额上回及右颞上回ReHo值降低。相对患者组,易感组右壳核、小脑后叶、颞上回及扣带回ReHo值升高,左楔前叶及额上回ReHo值降低(P均0.05)。结论:抑郁障碍是一个涉及多脑区、多系统的疾病;这些异常脑区可能是抑郁易感的病理脑区。     

首发抑郁症患者静息态MRI脑局部一致性的改变

目的 利用静息态MRI 技术去探索首发抑郁症患者特异脑区的脑功能改变。方法 对符 合抑郁症诊断标准的20 例患者及20 名健康志愿者进行静息态MRI检查,使用静息态MRI局部一致性 （ReHo）分析方法,比较抑郁症组与对照组ReHo 值,发现特异性增高或减低的脑区。结果 抑郁症组 对比对照组,ReHo 增高的脑区有小脑后叶、颞下回、枕中回、舌回、中央后回、中央前回、额上回、顶 叶等;ReHo 降低的脑区有边缘叶、海马旁回、壳核、丘脑、豆状核、额下回、额中回、楔前叶、扣带回等。 结论 静息态MRI 的ReHo 分析方法可能发现抑郁症异常的脑区,为抑郁症发病机制的探索提供帮助。     

不同亚型轻度认知障碍患者静息态脑功能局部一致性研究

目的探讨遗忘型和非遗忘型轻度认知障碍(mild cognition impairment,MCI)患者局部自发脑活动特点。方法纳入遗忘型MCI(amnesicMCI,aMCI)患者25例,非遗忘型MCI(non-amnesticMCI,naMCI)患者21例和正常对照(normal control,NC)15名进行静息态功能磁共振扫描,通过计算每个给定体素与其最邻近26个体素时间序列的相似性获得全脑局部一致性(regional homogeneity,ReHo)图,比较三组被试全脑ReHo差异。结果 aMCI组右侧额叶ReHo值低于NC组,左侧颞中回和左侧小脑ReHo值高于NC组(P0.05,Alphasim校正);naMCI组前扣带回和右侧额中回ReHo值低于NC组,右侧海马旁回、右侧颞中回和右侧楔前叶ReHo值高于NC组(P0.05,Alphasim校正);aMCI左侧前额叶和左侧颞中回ReHo值高于naMCI组,右侧小脑ReHo值低于naMCI组(P0.05,Alphasim校正)。结论 aMCI和naMCI患者左侧前额叶、左侧颞中回及右侧小脑自发脑功能活动存在差异,这为区别aMCI和naMCI两者脑功能活动特点提供了初步影像学依据。     

注意缺陷多动障碍儿童静息态的脑功能磁共振成像研究

目的 探讨注意缺陷多动障碍(ADHD)儿童静息态脑功能磁共振成像的特点.方法 对15名正常学龄期儿童(对照组)和14例ADHD儿童(ADHD组)进行静息态功能磁共振成像(fMRI)扫描,采用局部一致性(ReHo)作为测最指标.结果 ADHD组在双侧顶下小叶(Z=3.73,Z=3.34)、双侧楔叶(Z=3.42,Z=3.86)、左侧额中回(Z=3.24)、左侧颢中同(Z=3.24)、左侧楔前叶(Z=3.45)及右侧岛叶(Z=3.09)、右侧小脑(Z=3.42)等区域的ReHo值低于对照组,而双侧额下回(Z=3.19,Z=2.93)的ReHo值高于对照组.结论与对照组比较,静息态下ADHD患者与执行控制功能、注意认知功能及默认网络功能等相关区域存在异常.     

Regional Homogeneity Brain Alterations in Schizophrenia: An Activation Likelihood Estimation Meta-Analysis

ObjectiveResting state functional magnetic resonance imaging (rsfMRI) provides a lot of evidence for local abnormal brain activity in schizophrenia, but the results are not consistent. Our aim is to find out the consistent abnormal brain regions of the patients with schizophrenia by using regional homogeneity (ReHo), and indirectly understand the degree of brain damage of the patients with drug-naive first episode schizophrenia (Dn-FES) and chronic schizophrenia. MethodsWe performed the experiment by activation likelihood estimation (ALE) software to analysis the differences between people with schizophrenia group (all schizophrenia group and chronic schizophrenia group) and healthy controls. ResultsThirteen functional imaging studies were included in quantitative meta-analysis. All schizophrenia group showed decreased ReHo in bilateral precentral gyrus (PreCG) and left middle occipital gyrus (MOG), and increased ReHo in bilateral superior frontal gyrus (SFG) and right insula. Chronic schizophrenia group showed decreased ReHo in bilateral MOG, right fusiform gyrus, left PreCG, left cerebellum, right precuneus, left medial frontal gyrus and left anterior cingulate cortex (ACC). No significant increased brain areas were found in patients with chronic schizophrenia. ConclusionOur findings suggest that patients with chronic schizophrenia have more extensive brain damage than FES, which may contribute to our understanding of the progressive pathophysiology of schizophrenia.     

Altered regional homogeneity and connectivity in cerebellum and visual-motor relevant cortex in Parkinson's disease with rapid eye movement sleep behavior disorder

ObjectiveRapid eye movement sleep behavior disorder (RBD) frequently occurs in Parkinson's disease (PD), however, the exact pathophysiological mechanism underlying its occurrence is not clear. In this study, we explored whether there is abnormal spontaneous neuronal activities and connectivity maps in some brain areas under resting-state in PD patients with RBD.MethodsWe recruited 38 PD patients (19 PD with RBD and 19 PD without RBD), and 20 age- and gender-matched normal controls. We used resting-state functional magnetic resonance imaging (RS-fMRI) to analyze regional homogeneity (ReHo) and functional connectivity (FC), and further to reveal the neuronal activity in all subjects.ResultsCompared with the PD without RBD patients, the PD with RBD patients showed a significant increase in regional homogeneity in the left cerebellum, the right middle occipital region and the left middle temporal region, and decreased regional homogeneity in the left middle frontal region. The REM sleep behavioral disorders questionnaire scores were significantly positively correlated with the ReHo values of the left cerebellum. The functional connectivity analysis in which the four regions described above were used as regions of interest revealed increased functional activity between the left cerebellum and bilateral occipital regions, bilateral temporal regions and bilateral supplementary motor area.ConclusionThe pathophysiological mechanism of PD with RBD may be related to abnormal spontaneous neuronal activity patterns with strong synchronization of cerebellar and visual-motor relevant cortex, and the increased connectivity of the cerebellum with the occipital and motor regions.     

Decreased regional homogeneity in lingual gyrus,increased regional homogeneity in cuneus and correlations with panic symptom severity of first-episode,medication-naïve and late-onset panic disorder patients

This study was designed to explore regional homogeneity (ReHo), an indicator of the synchronization of brain function, in first-episode, medication-naïve and late-onset patients with panic disorder (PD). Participants comprised 30 patients and 21 healthy controls who underwent with 3-Tesla magnetic resonance imaging (MRI) scanning and ReHo functional MRI analysis. All participants were studied with clinical rating scales to assess the severity of PD symptoms. ReHo values were obtained using the REST toolbox (resting-state functional MRI data analysis toolbox). Differences in demographic data and ReHo values between the two groups were evaluated with the independent two-sample t-test function of the Statistical Package for the Social Sciences and REST. There were significant differences in clinical ratings between the two groups. No demographic differences were noted. We found decreased ReHo in the left lingual gyrus and increased ReHo in the right cuneus cortex of patients compared with controls. ReHo values of patients were negatively correlated with PD ratings in the right cuneus. ReHo differences found in the left lingual gyrus and the right cuneus might suggest sensory and inhibitory dysfunction in first-episode, medication-naïve, late-onset patients with PD.     

Aberrant regional homogeneity in Parkinson’s disease: A voxel-wise meta-analysis of resting-state functional magnetic resonance imaging studies

Studies of abnormal regional homogeneity (ReHo) in Parkinson’s disease (PD) have reported inconsistent results. Therefore, we conducted a meta-analysis using the Seed-based d Mapping software package to identify the most consistent and replicable findings. A systematic literature search was performed to identify eligible whole-brain resting-state functional magnetic resonance imaging studies that had measured differences in ReHo between patients with PD and healthy controls between January 2000 and June 4, 2016. A total of ten studies reporting 11 comparisons (212 patients; 182 controls) were included. Increased ReHo was consistently identified in the bilateral inferior parietal lobules, bilateral medial prefrontal cortices, and left cerebellum of patients with PD when compared to healthy controls, while decreased ReHo was observed in the right putamen, right precentral gyrus, and left lingual gyrus. The results of the current meta-analysis demonstrate a consistent and coexistent pattern of impairment and compensation of intrinsic brain activity that predominantly involves the default mode and motor networks, which may advance our understanding of the pathophysiological mechanisms underlying PD.     

Regional homogeneity abnormalities in patients with tensiontype headache：a resting-state fMRI study

Tension-type headache（TTH） is the most prevalent type of primary headache. Many studies have shown that the pathogenesis of primary headache is associated with fine structural or functional changes. However, these studies were mainly based on migraine. The present study aimed to investigate whether TTH patients show functional disturbances compared with healthy subjects. We used restingstate functional magnetic resonance imaging（f MRI） and regional homogeneity（Re Ho） analysis to identify changes in the local synchronization of spontaneous activity in patients with TTH. Ten patients with TTH and 10 age-, gender-, and education-matched healthy controls participated in the study. After demographic and clinical characteristics were acquired, a 3.0-T MRI system was used to obtain restingstate f MRIs. Compared with healthy controls, the TTH group exhibited significantly lower Re Ho values in the bilateral caudate nucleus, the precuneus, the putamen, the left middle frontal gyrus, and the superior frontal gyrus. There was no correlation between mean Re Ho values in TTH patients and duration of TTH, number of attacks, duration of daily attacks, Visual Analogue Scale score, or Headache Impact Test-6 score. These results suggest that TTHpatients exhibit reduced synchronization of neuronal activity in multiple regions involved in the integration and processing of pain signals.