Wearable Electrical Impedance Tomography Belt With Dry Electrodes

• Published in: IEEE transactions on biomedical engineering Vol. 69; no. 2; pp. 955 - 962
• Main Authors: Lin, Bor-Shing, Yu, Hong-Ren, Kuo, Yu-Ting, Liu, Yu-Wei, Chen, Heng-Yin, Lin, Bor-Shyh
• Format: Journal Article
• Language: English
• Published: United States IEEE 01.02.2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; Belts; Conductivity; Conductivity distribution; dry electrodes; Electric Impedance; Electrical impedance; Electrical impedance tomography; Electrodes; Gauss–Newton method; Gels; Human body; Humans; Image processing; Image reconstruction; Impedance; Newton methods; specific belt mechanism design; Tomography; Tomography - methods; Tomography, X-Ray Computed; Voltage measurement; Wearable Electronic Devices; Wearable technology; Wireless communication
• ISSN: 0018-9294; 1558-2531; 1558-2531
• DOI: 10.1109/TBME.2021.3110527

Objective: Electrical impedance tomography (EIT) is a noninvasive imaging technology used to reconstruct the conductivity distribution in objects and the human body. Methods: In recent years, numerous EIT systems and image reconstruction algorithms have been developed. However, most of these EIT systems require conventional electrodes with conductive gels (wet electrodes) and cannot be adapted to different body types, resulting in limited applicability. Results: In this study, a wearable wireless EIT belt with dry electrodes was designed to enable EIT imaging of the human body without using wet electrodes. The specific design of the belt mechanism and dry electrodes provide the advantages of easy wear and adaptation to different body sizes. Additionally, the Gauss-Newton method was used to optimize the EIT image. Conclusion: Finally, experiments were performed on the phantom and human body to validate the performance of the proposed EIT belt. Significance: The results demonstrate that the proposed system can provide accurate location information of the objects in the EIT image and the system can be successfully applied for noninvasive measurement of the human body.