摘要：AbstractThe electrical impedance tomography (EIT) is a medical imaging modality in which a current is applied to the body through electrodes and potential measurements are taken at discrete points in the surface. It is capable of imaging objects interior with a portable equipment and does not involve radiation. In order to reconstruct the image from the measurements, an ill-posed inverse problem needs to be solved. Due to its characteristics, it is a challenge to obtain the static conductivity distribution image of the body. The electrode modeling is particularly difficulty as it needs to faithfully simulate the contact impedance between the metal and the skin. Moreover, in practical applications, a gel may be applied, creating a new transport layer. Thus, in this work, a new FEM electrode model is proposed to more adequate represent the practical application. It consists of two layers, one simulating the metal-body contact and the second representing the gel layer. Tests were conducted with two sets of data: one from a physical phantom experiment and another from an in vivo experiment. Results show the difference between models. However, the methods must be improved in order to obtain more conclusive observations.
关键词：KeywordsMedical ImagingElectrical Impedance TomographyFinite Element Model
