Technical implementation and evaluation of a bioelectrical breast scanner

Impedance measurements can be used to visualize the distribution of resistivity inside human body. Using arrays of electrodes allows images to be reconstructed. The examination of the breast using an automated examination bank has been realized. The electrodes are moved by pneumatic jacks. This technique both reduces the examination time and ensures a more regular electrode geometry than by manual operation. The final electrode positioning is controlled by the operator and can be easily adjusted. Thirty-two electrodes are shared by sixteen current sources and sixteen differential voltmeters. Due to capacitive properties of the tumors of the breast and the need for reference values, the data are collected at two frequencies. The system described is noninvasive and of relatively low cost.<>