A multifrequency Electrical Impedance Tomography (EIT) system for biomedical imaging

Multifrequency Electrical Impedance Tomography (EIT) is preferred for imaging of biomedical objects to study their wide range of tissue conductivity profiles among different type of subjects under test. In this direction, a multifrequency EIT system is developed for biomedical imaging and the resistivity imaging of a practical phantom is studied at different frequencies. Practical biological phantoms are developed with NaCl solution as the bathing medium and vegetable tissue cylinders as the inhomogeneity. A sinusoidal constant current is injected to the boundary of the practical phantoms at different frequency levels and the surface potentials are measured. Resistivity images are reconstructed from the boundary potential data using EIDORS and images are analyzed with image contrast parameters. Results show that the instrumentation part of the developed EIT system injects constant current at different frequency levels and measures the boundary potential data. Boundary data are successfully generated for all the frequencies and found suitable for image reconstruction. CNR, PCR and COC of the resistivity images show that the resistivity images are efficiently reconstructed from the boundary data acquired from the multifrequency EIT system.