A 0.63-mm2/Ch 1.3-mΩ/√ Hz-Sensitivity 1-MHz Bandwidth Active Electrode Electrical Impedance Tomography System

Due to the coronavirus pandemic, portable electrical impedance tomography (EIT) systems [1]–[3] have been considered as the only variable wearable medical lung imaging solution for monitoring the treatment of pneumonia patients and their recovery. Generally, the EIT system is classified into passive EIT (P-EIT) [3]–[6] or active electrode EIT (AE-EIT) [2]. The AE-EIT system is preferred as it amplifies and digitalizes the small signals while minimizing the noises incurred by motion artifacts, complex long wire connection, large variation in electrode contact, and stray capacitance problems, which is important for high-performance imaging applications.