A quasi-static model for the ring capacitor applicator

An investigation of the electromagnetic heat dissipation in a radially layered biological tissue inside a ring capacitor applicator is discussed. A quasi-static model is introduced to compute the relevant electromagnetic field quantities. The method of computation uses the spatial Fourier transform of all field quantities with respect to the axial coordinate. After an iterative solution of a dual boundary value problem for the electric potential and the current density at the electrodes, an inverse Fourier transform is carried out to compute the quantities that are of interest to the deep-body system at hand. Comparison of numerical results with phantom measurements shows excellent agreement.