Finite difference-time domain analysis of power deposition pattern of an array of interstitial antennas

The finite-difference time-domain (FDTD) technique is used for accurately determining the power deposition patterns in 3D models of inhomogeneous tissue. Near-field radiation from an array of interstitial antennas has been used to calculate the incident fields. Results for both uniformly and stepped insulated antennas are presented and compared with previously obtained data using the method of moments. The advantages of the FDTD method in accurately modeling inhomogeneous tissue and, in particular, dielectric interfaces are illustrated. The results are of interest in connection with the use of interstitial antennas in microwave hyperthermia for cancer treatment.<>