Heating applicator based on reentrant cavity with optimized local heating characteristics

Abstract

A heating region can be robustly and optimally localized by using the Taguchi method and considering the variation in the size of the heating object.

Localized heating characteristics of hyperthermia using a reentrant cavity

“…Since it is difficult to measure the temperature during the heating period in real time, it is not certain whether a tumour with a smaller size can be heated regionally with sufficient repeatability. However, since the frequency increase accompanying miniaturization can be controlled by this proposed method, we think that the full width at half maximum of the SAR distribution is 50 mm or less by the miniaturization of the applicator using an optimization technique [25]. In addition, we have examined the possibility of non-invasive temperature measurement by using the property of standing waves in the reentrant-type applicator, and we expect that small localized tumours can be heated significantly by this method [26].…”

Regional heating by insertion of dielectrics and rotation of the focused electric field in the hyperthermia

“…Through numerical and experimental analyses, we indicated that localized heating with this method is possible [3], [4]. In addition, we attempted to reduce the size of the applicator [5], [6] as well as optimizing the applicator using experimental design methods [7] in order to improve the therapeutic effect of a cancer, and showed that the electric field distribution between the reentrant electrodes can be localized within a space region of 70-80 mm in diameter. However, when the subject of treatment is a small cancer localized in the head and neck lesion, a region of 30-50 mm in diameter must be selectively heated and thus the heating characteristics achieved in previous studies are still insufficient.…”