关键词: 电阻抗断层成像;电极;多路开关

    摘 要:目的 在电阻抗断层成像技术中，为实现多电极条件下的激励和测量信号依据不同的需要进行加载和高速切换，设计驱动和测量模式程控系统. 方法 采用高速CMOS多路开关、逻辑电路和光电隔离电路实现驱动和测量模式程控系统. 结果 在有32个驱动电极和32个测量电极的EIT成像系统中，该系统能程控实现任意两电极的驱动及任意两电极的信号测量. 结论 基于多路开关的驱动和测量模式程控系统在信号加载和传输中具有高速、低导通电阻、各通道一致性好的特点.

    Design of a programmable control system for driv┐ing and measurement mode in EIT

    YOU Fu-Sheng，DONG Xiu-Zhen，QIN Ming-Xin，SHI Xue-Tao，FU Feng，LIU Rui-Gang，TANG Meng-Xing，LI Jiang，WU Xiao-Ming

    Department of Medical Electronic Engineering，Fac-ulty of Biomedical Engineering，Fourth Military Medical University，Xi'an710033，China

    Keywords:electrical impedance tomography;electrodes;multiplexer

    Abstract:AIM In electrical impedance tomography(EIT)there are many electrodes for driving and measurement.In order to configure the different driving and measurement mode with high speed ......