Design of a Wearable Parallel Electrical Impedance Imaging System for Healthcare

A wireless wearable electrical impedance tomography (EIT) system has been developed using the AD5933 for real-time lung respiration imaging. The system uses a current injection method tailored to the human body's impedance characteristics. It applies a voltage excitation and measures the resulting current as the voltage passes through the body. Additionally, measures are taken to suppress the effects of parasitic capacitance, which can lead to signal oscillations and leakage currents. Additionally, to improve data acquisition speed, five AD5933 units are used for parallel measurements, with multiple measures taken to ensure high synchronization during the parallel acquisition process. The results demonstrate conductivity images generated from the EIT system, with data collected from a water tank, human lungs during respiration, and a human calf at rest, confirming that this portable EIT system can measure biological tissues with high precision and low cost.