METHODS: The head was simplified to a two-layer conductive sphere and the single measurement channel of MIT was approximated to an axial symmetric electromagnetic model.

• 方法:将头颅近似为一个双层的导电球体,脑MIT单通道测量系统近似为由测量、激励线圈和球体组成的轴对称模型,采用时谐电磁场分析方法,推导出轴对称模型的解析解。