波谱学杂志

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人脑初级视皮层内事件相关型视觉刺激fMRI BOLD响应特性初步研究

吴义根1, 田志雄2, 黄雄2, 吴光耀2, 李丽云3, 孙骏谟2, 刘买利3, 唐孝威1, 4*   

  1. 1.中国科学院高能物理研究所,中国科学院核分析开放实验室,北京918信箱,北京 100039;  2.武汉大学附属中南医院, 湖北武汉 430071;
    3.中国科学院武汉物理与数学研究所,波谱与原子分子物理国家重点实验室, 湖北 武汉 430071;  4.浙江大学物理系, 浙江杭州 310027
  • 收稿日期:2002-12-20 修回日期:2003-03-20 出版日期:2003-09-05 发布日期:2003-09-05
  • 作者简介:吴义根(1964-),男,江苏东台人,硕士,副研究员,从事脑功能成像原理及应用专业. *通讯联系人: 唐孝威,E-mail: tangxw@zju.edu.cn
  • 基金资助:

    国家重点基础研究规划“脑功能和脑重大疾病的基础研究”资助项目(1999054006).

ON PROPERTIES OF EVENT-RELATED fMRI BOLD RESPONSE IN PRIMARY VISUAL CORTEX OF HUMAN BRAIN DURING VISUAL STIMULATION

WU Yi-gen1, TIAN Zhi-xiong2, HUANG Xiong2, WU Guang-yao2, LI Li-yun3, SUN Jun-mo2, LIU Mai-li3, TANG Xiao-wei1, 4*   

  1. 1.Institute of High Energy Physics and Laboratory of Nuclear Analysis Techniques,The Chinese Academy of Sciences,P.O. Box 918,Beijing 100039, China;
    2.Zhongnan Hospital,Wuhan University,Wuhan 430071, China;
    3.State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,Wuhan Institute of Physics and Mathematics, The Chinese Academy of Sciences,Wuhan 430071, China; 4.Department of Physics, Zhejiang University, Hangzhou 310027, China
  • Received:2002-12-20 Revised:2003-03-20 Online:2003-09-05 Published:2003-09-05
  • About author:*Correspondence author:Tang Xiao-wei,E-mail:tangxw@zju.edu.cn
  • Supported by:

    国家重点基础研究规划“脑功能和脑重大疾病的基础研究”资助项目(1999054006).

摘要:

基于脑血氧水平依赖(BOLD)对比的功能磁共振成像(fMRI)方法是研究脑功能活动的一种重要的无损伤探测手段,BOLD的机制及它与脑神经活动关系一直是国际上十分活跃的研究领域,尤其是在实验研究方面. 视觉刺激所引起的脑的初级视皮层(V1) 的BOLD响应的时间特性已有较多的研究,但是在这些研究中,有的结论认为BOLD对视觉刺激的响应是线性的,有的结论却是相反的. 我们采用事件关联型核磁共振功能成像(ER-fMRI)方法,研究不同的短暂视觉刺激持续时间下的BOLD响应,得到了视觉刺激下的脑激活图. 同时找出了视觉刺激时间分别是1、2、3、4、5和6 s的V1区的BOLD响应曲线,并初步显示出BOLD响应与刺激持续时间的线性关系.

关键词: 核磁共振, 事件关联型核磁共振功能成像, 脑血氧水平依赖, 视觉刺激, 脑激活图, 线性关系

Abstract:

Functional magnetic resonance imaging (fMRI) using the blood oxygenation level dependent (BOLD) contrast is an important noninvasive method to study
the functional activities of the brain. Many fMRI studies, especially the experimental studies,have focused on the mechanisms of the BOLD effect and its relationship with brain functions. Properties of fMRI BOLD response in the primary visual cortex of human brain during visual stimulation have been investigated previously,however the results obtained have been contradictory in terms of whether there is a linear relationship between the response and the stimulus. In this study, we applied event-related fMRI to study the BOLD response in human primary visual cortex to the short visual stimuli with durations of 1、2、3、4、5 and 6 seconds respetively. The results show that generally there is a linear relationship between the BOLD response and the duration of the stimulus.

Key words: event-related fMRI, BOLD, visual stimulation, brain activation map, linear relationship

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