3D Sensitivity of 6-Electrode FIM Through Experimental Study in a Phantom

Focused Impedance Measurement (FIM) is a relatively new technique developed in the Biomedical Physics Laboratory of Dhaka University which allows improved localization of a zone without much increase in complexity of the measuring instrumentation when the electrodes are applied on the skin surface with the organs inside contributing the measurement of impedance since the body is a volume conductor. The present work is an experimental study of the sensitivity of the 6-electrode FIM system at different depths and lateral positions inside a volume conductor with respect to the electrode-positions using a cubical phantom with saline. An object of different conductivity and of size smaller than the electrode separation was placed inside the phantom at different positions to measure the change of FIM value, called sensitivity This work will help standardize the application of 6-electrode FIM for determination of impedance of organs inside the human body.