Electrical Conductivity Imaging via Contactless Measurements (MIT)

Body tissues have different electrical conductivity and permitivity values which change as a function of frequency. The electrical properties of body tissues change depending on the state of health.   Due to these features, electrical impedance is an important physical property that can be used for medical imaging purposes. In Applied Current Electrical Impedance Tomography (ACEIT) currents are applied from the surface electrodes and resulting surface voltages are measured from the body surface. In Induced Current Electrical Impedance Tomography (ICEIT) currents are induced inside the conducting body using time-varying magnetic fields generated by the nearby coils. As in ACEIT, the voltage measurements are acquired by electrodes attached to the body surface. Contactless measurements can be obtained when currents are induced by time-varying magnetic fields and measurements are obtained by employing nearby coils. Magnetic Induction Tomography (MIT) was proposed to image the electrical impedance of body tissues based on contactless measurements. METU BERG is one of the pioneers of this approach. Thesis studies and projects have been completed on theoretical, numerical, and experimental aspects of MIT.