基于脑镜像同伦功能连接和以双侧距状沟为种子点功能连接观察早盲青少年静息态功能MRI改变

Based on Interhemispheric Voxel-Mirrored Homotopic Connectivity and Function Connectivity with the Bilateral Calcarine as the Seed in Observing the Changes of Resting-State Functional MRI in Early Blind Adolescents

目的利用体素镜像同伦功能连接(VMHC)和基于种子点的功能连接方法研究早盲青少年静息态下的大脑半球间及选定种子点与全脑其他脑区的功能连接变化。资料与方法招募2015年6—8月广州市盲人学校的早盲青少年23例及性别、年龄相匹配的正常视力青少年志愿者21例,对所有受试者进行颅脑静息态功能MRI扫描,计算并比较两组VMHC值。以VMHC具有显著差异的脑区作为种子区,计算并比较其与全脑所有体素之间的功能连接。结果与正常视力青少年志愿者相比,早盲青少年组双侧距状沟为peak点的枕叶视觉皮层和双侧小脑半球、右侧颞下回VMHC显著减低(FDR校正,P<0.05)。早盲青少年组双侧距状沟(VMHC显著减低脑区)与右侧楔叶及右侧中扣带回功能连接减低,而双侧距状沟与右侧小脑半球Crus1功能连接增强(FDR校正,P<0.05)。结论早盲青少年以初级视觉皮质为主的双侧视觉皮层半球间及其与多个脑区的功能连接出现异常,提示初级视觉中枢与其他感知觉皮层的协调功能异常,可能与视觉缺失引起的脑结构与功能重塑有关。

Purpose To investigate the changes of interhemispheric functional connectivity and functional connectivity between the selected region of interest(ROI)and other brain areas of the whole brain in resting state in early-blind adolescents(EBAs)via the voxelmirrored homotopic connectivity(VMHC)and seed-based functional connectivity methods.Materials and Methods A total of 23 EBAs in the Guangdong Province Blind School and 21 age-and gender-matched normal-sighted controls were recruited from June to August 2015.Brain resting-state magnetic resonance imaging scans were performed on all participants.The VMHC were calculated and compared between these two groups.And take the most significant brain area of VMHC as the ROI,the functional connectivity between it and all voxels in the whole brain were calculated and compared,respectively.Results Compared with the control groups,the EBAs groups showed decreased VMHC values in the occipital visual cortex with bilateral calcarine as peak point,bilateral cerebellum and right inferior temporal gyrus(FDR corrected,P<0.05).The EBAs group showed a decreased functional connectivity between bilateral calcarine(brain areas with significantly reduced VMHC),set as ROI and the right cuneus and middle cingulum gyrus,while the enhanced functional connectivity between the bilateral calcarine and the right cerebellum-Crus1 when compared with normal-sighted controls(false discovery rate,FDR corrected,P<0.05).Conclusion The visual cortex interhemispheres mainly in the primary visual cortex of EBAs and its functional connections with multiple brain regions are abnormal,which may indicate abnormal coordination between the primary visual center and other perceptual cortex,and may be related to the brain structure and function remodeling caused by visual loss.