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Electrical impedance tomography (EIT) is an imaging method that is able toestimate the electrical conductivity distribution of living tissue. This workpresents a field programmable gate array (FPGA)-based multi-frequency EITsystem for complex, time-resolved bioimpedance measurements. The system has thecapability to work with measurement setups with up to 16 current electrodes and16 voltage electrodes. The excitation current has a range of about 10 $\mu$A to5 mA, whereas the sinusoidal signal used for excitation can have a frequency ofup to 500 kHz. Additionally, the usage of a chirp or rectangular signalexcitation is possible. Furthermore, the described system has a sample rate ofup to 3480 impedance spectra per second (ISPS). The performance of the EITsystem is demonstrated with a resistor-based phantom and tank phantoms.Additionally, first measurements taken from the human thorax during a breathingcycle are presented.

A FPGA-Based Broadband EIT System for Complex Bioimpedance Measurements -- Design and Performance Estimation