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.

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Keywords 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
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Journal IEEE Transactions on Biomedical 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