An Instrumental Electrode Configuration for 3-D Ultrasound Modulated Electrical Impedance Tomography

Abstract

Ultrasound modulated electrical impedance tomography (UMEIT) is a novel hybrid imaging technique, which utilizes coupling between electric and acoustic modalities. Based on the forward solver along different current directions, an instrumental electrode configuration is proposed for 3D UMEIT. The proposed electrode configuration can produce a similar longitudinal current, making the power density distribution on the x-y plane approximately consistent with the corresponding conductivity distribution. Then, this satisfying power density is adopted to reconstruct a higher-resolution conductivity distribution. Therefore, the proposed electrode configuration contributes to improving the image reconstruction quality of UMEIT. Also, to clearly demonstrate its meaning in theory, the forward solver results are analyzed from an electrical point of view. In addition, the nonlinear partial differential equation (PDE) relating the power density to the measured data is derived again with a more reasonable expression. Finally, simulation with realistic geometry model of human breast is done and feasibility verifying experiment is made. Both simulation and experimental results validate the feasibility of the proposed electrode configuration.

Review on Electrical Impedance Tomography: Artificial Intelligence Methods and its Applications

“…They have also compared the model performance by using RMSE and Pearson's correlation coefficient [84]. An analysis of the performance of the EIT approach for detecting breast cancer has been studied [3]. Two softwares called OCTAVE and EIDORS were used for simulation purposes.…”

“…The aim here is to reconstruct the electrical permittivity and conductivity distributions inside the object from the knowledge of the measured electrode voltages and applied current patterns by solving an inverse problem [2]. In EIT, any substantial changes in impedance would only result in a minor change at the surface which makes the solution of the inverse problem a highly challenging task [3].…”