Voltage versus current driven high frequency EIT systems

Current driven Electrical Impedance Tomography systems become inadequate at higher frequencies. Voltage driven systems however are very well suited to operate correctly at those frequencies. Therefore the MICAS-EIT system is presented as an example of a voltage driven EIT system. Experiments have confirmed the feasibility of this approach. The MICAS Open EIT software which runs on IBM-compatible computers offers the possibility to control and process the data gathered by the hardware and provides the clinician with a user friendly graphical interface. The main differences between current driven and voltage driven EIT systems for high frequency applications are also discussed and a comparison with the authors´ EIT system is made