Ag／AgCl粉末电极和镀层电极在脑部EIT测量中的比较研究

目的：针对一种新型的医用Ag／AgCl粉末电极和传统的医用Ag／AgCl镀层电极，比较两者在脑部电阻抗断层成像（Electrical Impedance Tomography，EIT）测量中的性能差异。方法：基于自行开发的EIT系统，分别利用Ag／AgCl粉末电极和镀层电极，分别对物理模型和人体对象进行脑部电阻抗断层成像测量，并且通过提出的两个指标（高频信噪比和低频信噪比）及接触阻抗来评价电极系统的特性。结果：相对于Ag／AgCl镀层电极，Ag／AgCl粉末电极具有更好的抗噪性和稳定性。结论：Ag／AgCl粉末电极能更有效地满足脑部EIT监护的要求。

Comparison of Performances of Ag/AgCl Coating Electrodes and Pulverized Electrodes in Cerebral Application of Electrical Impedance Tomography

Objective To compare the performance of novel Ag/AgCl pulverized electrodes with conventional Ag/AgCl coating electrodes in cerebral application of Electrical Impedance Tomography(EIT).Methods Based on the EIT system developed by our group,raw data were measured on a phantom and an adult volunteer,with Ag/AgCl coating electrodes and pulverized electrodes,respectively.The performances of electrode systems were evaluated in contact impedance and two other figures(the high-frequency SNR,HFSNR;the low-frequency SNR,LFSNR).Results Ag/AgCl pulverized electrode plays a better performance in resisting noise and keeping stabilization.Conclusion Ag/AgCl pulverized electrode develops the needs of imaging and monitoring human brains in EIT more availably.