Case Study: Electrical Impedance of Novel Materials

In an effort to develop a reusable phantom for high-channel electrical impedance tomography experimentation, a custom tetrapolar probe was designed and built. The probe consists of four 0.02” diameter platinum wires spaced 5mm apart, housed in a PEEK block. Sample measurements were taken using a LCR meter (Hioki IM3536). Contact between samples and probe was facilitated using a small droplet of ionic solution (1 M KCl, ~11 S/m) at each platinum wire tip. To assess anisotropy, the probe was randomly oriented on the surface of a sample for at least five individual measurements, each comprising of 10 repeated frequency sweeps (1-200 kHz).

A conference presentation utilizing this technique can be found here: Characterizing novel phantom materials for biomedical applications of electrical impedance tomography from EIT2023.