A voltage driven current tomograph

An adaptive drive electrical impedance tomograph which uses a novel front-end architecture is presented. Programmable voltage sources have been used to deliver currents into the study object to avoid the difficulties of obtaining multiple, well-matched, high quality current sources. By inverting the admittance matrix, the system is capable of achieving a desired current drive pattern by applying a computed set of electrode voltages. The instrument operates at ≈10kHz and comprises 32-driven electrodes and 32-voltage measurement electrodes.