Real-Time Monitoring of Contact Impedance From Multiple Electrode–Scalp Interfaces During Cerebral Electrical Impedance Tomography

IEEE Access

Hang Ma¹  Junying Xia¹  Xuetao Shi¹  Feng Fu¹  Xuechao Liu¹  Weichen Li²  Benyuan Liu²  Xiuzhen Dong²  Haoting Li² 

[1] School of Biomedical Engineering, Air Force Medical University, Xi&x2019;an, China;

关键词: Contact impedance;    electrical impedance tomography;    electrode–scalp interface;   

DOI  :  10.1109/ACCESS.2019.2928580

来源: DOAJ

【 摘 要 】

Electrical impedance tomography (EIT) is a promising medical technique for monitoring brain injury through the reflection of electrical impedance changes in internal brain tissues. However, the contact impedances at the electrode-scalp interfaces can still notably affect the EIT accuracy. Hence, we propose a method for real-time monitoring the multi-channel contact impedances of cerebral EIT using a reference electrode attached close to the head vertex. This method allows to approximate inter-channel differences and changes over time of multi-channel contact impedances. The experimental results on 36 volunteers show that the maximum relative inter-channel difference obtained from 16 disposable surface electrodes reaches 18.7%, and the maximum relative change over time reaches 19.2%. The proposed method can assist clinicians in real-time monitoring of contact conditions from the multiple electrode-scalp interfaces during the clinical application of the cerebral EIT.

【 授权许可】

Unknown