磁共振弥散张量成像评价特发性失嗅 脑白质微细结构损害的研究*
姚淋尹1 郭怡辰1 占小俊1 孙智甫1 李瑛2 魏永祥1
[摘要] 目的:应用磁共振弥散张量成像(DTI)技术研究特发性失嗅患者脑白质微细结构的改变。方法:对
16例特发性失嗅患者(患者组)与16例年龄、性别相匹配的健康志愿者(对照组)进行 SniffinStick嗅觉功能测试 及脑 DTI检查。在 DTI生成的各向异性分数(FA)参数图上选择双侧梨状皮层、眶额皮层、海马、岛叶邻近白质 和内囊为感兴趣区(ROI),计算每个 ROI的FA 值。采用独立样本t检验比较患者组和对照组间 ROI的FA 值差 异,并与 MMSE评分进行相关性分析。结果:患者组双侧梨状皮层、眶额皮层、海马及岛叶邻近白质 FA 值低于 对照组(P<0.05),而双侧内囊 FA 值两组间比较差异无统计学意义(P>0.05)。结论:特发性失嗅患者存在嗅 觉皮层邻近脑白质微细结构的损害,对于特发性失嗅的发病机制及早期干预具有重要的意义。
[关键词] 特发性失嗅;白质;微细结构;弥散张量成像
doi:10.13201/j.issn.1001-1781.2018.06.009
[中图分类号] R765.6 [文献标志码] A
Preliminary study of DTI on cerebral white matter micro-structure of patients with idiopathic olfactory loss
YAO Linyin1 GUO Yichen1 ZHAN Xiaojun1 SUN Zhifu1 LI Ying2 WEI Yongxiang1
(1 Department of Otorhinolaryngology Head and Neck Surgery,Beijing Anzhen Hospital,Cap-
ital Medical University,Beijing,100029,China;2 Department of Radiology,Beijing Anzhen Hospital,Capital Medical University)
Corresponding author:WEI Yongxiang,E-mail:wei.yongxiang@hotmail.com
Abstract Objective:To investigate the cerebral white matter micro-structure in patients with idiopathic olfac-
tory loss using diffusion tensor imaging(DTI).Method:Sixteen patients with idiopathic olfactory loss and sixteen normal subjects matched by age and sex were recruited in this study.SniffinStick olfactory test was performed to evaluate the olfactory function of all subjects.We acquired diffusion tensor images with an echo planar imaging
(EPI)sequence from all subject on a 3Tscanner.The fractional anisotropy (FA)images were performed using DTI-studio,and bilateral Piriform cortex,Orbitofrontal cortex,Hippocampus and Insula cortex adjacent white matter and Capsula interna were delineated as the region of interesting(ROI),the FA for each ROI was calculat-
ed.Independent sample t test analysis was used to compare the FA value of all ROIs between the controls and pa-
tients.In addition,correlation analysis between FA value and MMSE score in patients were conducted.Result:
Compared with the controls,patients showed significantly decreased FA value in the adjacent white matter of bi-
lateral Piriform cortex,Orbitofrontal cortex,Hippocampus and Insula cortex(P<0.05).There is no significant difference of FA value in bilateral Capsula interna between two groups(P>0.05).Conclusion:The patients with idiopathic olfactory loss show the damage of white matter micro-structure in the olfactory center,which could be important for the pathogenesis study and early intervention of idiopathic olfactory loss.
Key words idiopathic olfactory loss;white matter;micro-structure;diffusion tensor imaging
* 基 金 项 目:“十 三 五 ”国 家 重 点 研 发 项 目 (No:
2016YFC0800700);国家自然科学基金(No:81670903);首 都医科大学附属北京安贞医院院长基金(No:2016Z02)
1 首都医科大学附属北京安贞医院耳鼻咽喉头颈外科(北 京,100029)
2 首都医科大学附属北京安贞医院医学影像科 通信作者:魏永祥,E-mail:wei.yongxiang@hotmail.com
特发性失嗅(idiopathic olfactory loss,IOL)
是一种经过详细评估后尚不能发现病因的嗅觉丧 失,评估方法主要包括详尽的病史询问、嗅觉心理 物理测试、嗅觉通路磁共振检查或嗅觉事件相关电 位测试等。有研究指出特发性失嗅与认知障碍性 疾病有关,一些特发性失嗅患者可能进展为帕金森 病〔1〕,特发性失嗅也被认为是阿尔茨海默病和帕金 森病的早期表现之一〔1-2〕。我们前期研究发现〔3〕,
特发性失嗅患者脑灰质微细结构有不同程度的损 害,表现为嗅觉皮层灰质体积的减小。本研究拟在 |