Electrical impedance tomography for sensing with integrated microelectrodes on a CMOS microchip

Electrical impedance tomography (EIT) is an imaging method that is capable of reconstructing the three-dimensional (3D) internal conductivity distribution of a body using only electrical measurements made on the surface. This paper explores the theory and the linearisation approach of EIT in brief. A large scale model containing planar electrodes and electrolyte solution is implemented to test the EIT method. In this model, an obstacle made of insulating material is placed on the electrodes to investigate if EIT is able to identify the location of the obstacle. Subsequently, the EIT method is applied to observe biological cells in the micro-scale using measurements made with an array of microelectrodes on a CMOS microchip.