Simulation of intraluminal impedance.

Intraluminal impedance describes the electrical impedance inside the Gastrointestinal tract (GIT). These observations provide information about the state of the GIT that assists in the diagnosis. This paper presents numerical modeling of impedance measurements inside the GIT in order to evaluate the data generated under different conditions, such as various catheter configurations, different esophagus wall widths, different positions of the catheter inside the GIT and the presence of materials with different conductivities between the electrodes. The model used in the simulation assumes realistic esophagus and the values of the conductivities are obtained from literature. The results of this paper will be useful in the design and interpretation of the GIT impedance measurements.