Abstract
Recently published results confirm the positive effect of regionalhyperthermia combined with external radiotherapy on pelvic tumours.Several studies have been published on the improvement of RF annulararray applicator systems with dipoles and a closed water bolus.This study investigates the performance of a next-generationapplicator system for regional hyperthermia with a multi-ring annulararray of antennas and an open water bolus.A cavity slot antenna is introduced to enhance the directivity andreduce mutual coupling between the antennas.Several design parameters, i.e. dimensions, number of antennas andoperating frequency, have been evaluated usingseveral patient models.Performance indices have been defined to evaluate the effect of parametervariation on the specific absorption rate (SAR) distribution. The performance of the newapplicator type is compared with the Coaxial TEM.Operating frequency appears to be the main parameter with a positiveinfluence on the performance. A SAR increase in tumour of 1.7relative to the Coaxial TEM system can be obtained with a three-ring, six-antennaper ring cavity slot applicator operating at 150 MHz.
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