Localized current field hyperthermia in carcinoma of the cervix: 3-D computer simulation of SAR distribution

Software was developed for the 3D simulation of SAR distribution for a 500 kHz localized current field hyperthermia system to be used in patients with carcinoma of the cervix. This hyperthermia system was specifically designe d for use with a modified Fletcher-Suit intracavitary applicator. It consis ts of software modules for data input, tetrahedral grid generation and a nu merical calculation of SAR distribution using an adaptive, multilevel finit e element code. The AVS (Advanced Visual System, Inc.) system was used for the visual presentation of the results. A quasi-static approach was employe d for the determination of SAR distribution. Results of the performed numer ical tests were presented and they showed an important, clinically relevant ability to obtain a selective power deposition. This selective power depos ition depended on the applicator geometry, i.e. the distance between the co mponents of a Fletcher-Suit applicator and their relative position and the use of different modes of excitation.