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In electrical impedance tomography ͑EIT͒ currents are applied into a volume through electrodes and the resulting voltages at the electrodes are measured. The impedance distribution inside the volume can then be calculated by solving the associated inverse problem. Usually the equipment that is needed for the generation of the current patterns and the measurements are large, expensive and tailored to specific situations. In such cases many of the measurement parameters are fixed and the userdoi:10.1063/1.1147066 fatcat:l35lyxqcn5gtpa4nftkma5kbii