This paper presents a wearable sensor architecture for frequency-multiplexed electrical impedance tomography (EIT) and synchronous multilead electrocardiogram (ECG) data acquisition. The system is based on a novel electronic sensing architecture, called cooperative sensors, that significantly reduces the cabling complexity and enables flexible EIT stimulation and measurement patterns. The cooperative-sensor architecture was initially designed for ECG and has been extended for multichannel bioimpedance measurement. This approach allows for an adjustable EIT stimulation pattern via frequency-division multiplexing. This work also shows a calibration procedure as well as EIT system noise performance assessment. Preliminary measurements on a healthy volunteer showed the ability of the wearable system to measure EIT data synchronously with multilead ECG. Ventilation-related and heartbeat-related EIT images were reconstructed, demonstrating the feasibility of the proposed architecture for noninvasive cardiovascular monitoring.

active electrodes, bioimpedance, Biomedical measurement, biopotential, body sensor networks (BSN), calibration, cooperative sensors, Current measurement, dry electrodes, electrical impedance tomography (EIT), Electrocardiography, electrocardiography (ECG), Electrodes, frequency-division multiplexing, multichannel, multilead, Sensors, telemonitoring, Tomography, Voltage measurement, Wearable sensors
IEEE Transactions on Biomedical Engineering
Department of Systems and Computer Engineering

Rapin, M. (Michael), Braun, F. (Fabian), Adler, A, Wacker, J. (Josias), Frerichs, I. (Inez), Vogt, B. (Barbara), & Chetelat, O. (Olivier). (2018). Wearable Sensors for Frequency-Multiplexed EIT and Multilead ECG Data Acquisition. IEEE Transactions on Biomedical Engineering. doi:10.1109/TBME.2018.2857199