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Application of FDTD method for kidney microwave hyperthermia using annular phased array

The finite difference time domain (FDTD) method is used to determine the electromagnetic power distribution and calculate the specific absorption rates (SARs) inside human body. In this paper, this method is applied to evaluate SAR in an inhomogeneous tissue which has a cylindrical shape. An annular phased array (APA) consisting of eight dipoles is used to focus the SARs inside the model. A deionized water bolus is placed between the model and the radiating dipoles to improve field matching as well as to obtain superficial cooling. For this mode, focusing SAR by APA at one or both kidneys is investigated.