A novel voltage measurement approach for image reconstruction of Electrical impedance tomography

Noise is inherent to any real imaging system. In this paper, a new voltage measurement approach, called blend measure pattern, is developed to deal with anti-noise problem in electrical impedance tomography. The paper adopts a single current source, applies electrical currents to the body using a pair of adjacent electrodes. Different from the conventional adjacent voltage measure pattern, the proposed blend measure pattern improves system signal-to-noise ratio through selecting the larger cross measure voltage signal and discarding the smaller signal. Comparative study on the adjacent and blend measure patterns employing the fast Newtonpsilas one step error reconstructor (FNOSER) algorithm to the resolution of electrical impedance tomography has been conducted. The approach was validated with lab experiments. The results show that the proposed measure pattern has good anti-noise capability that dramatically reduces the dynamic change of measured electrode voltages, and produces clear image with less artificial inhomogeneities, compared to the adjacent measure pattern.