Wearable 3D Lung Ventilation Monitoring System with Multi Frequency Electrical Impedance Tomography

The wearable 3D lung ventilation monitoring system is proposed with electrical impedance tomography (EIT). It is implemented on the hub-module and impedance acquisition belt. Thanks to the active electrode SoC in the impedance acquisition belt, the proposed system provides wide (94dB) and accurate (1.4m Omega) impedance acquisition. Since the optimal frequency of stimulation current varies from individual, the selecting optimal stimulation frequency scheme is proposed for multi-frequency EIT. After the measured impedance data is transferred to hub-SoC in the Hub board, it is preprocessed and transferred to an external imaging device using Bluetooth module. As a result, the proposed system can display EIT images which are reconstructed with 90% of accuracy and 10 frames/s of real-time 3D lung images. It has only 357g weight and operates at least 6 hours with 3.7V 200mAh battery.