title: Design of hemispherical radio frequency (RF) capacitive-type electrode free of edge effects for treatment of intracavitary tumors.
abstract: A new hemispherical electrode to heat oral cavity cancer is proposed. The electrode does not produce a hot spot around its edge, a feature that usually arises when using radio frequency (RF) capacitive-type heating. The hemispherical electrode was designed by computer simulation using a 3-D finite element method. To assess its practicality and effectiveness, we built a prototype hemispherical electrode and evaluated its heating characteristics by phantom experiments. The heating effects on the phantom were measured by thermography. The concave phantom surface in contact with the hemispherical electrode showed a uniform increase in temperature, with no obvious edge effect. The proposed electrode allows non-invasive RF capacitive-type heating for intracavity tumors that was not previously considered possible, and should contribute to the multidisciplinary treatment of intracavity tumors.
authors.affiliation: Department of Radiation Oncology, Faculty of Medicine, Shimane University, Izumo, Japan. mmori@med.shimane-u.ac.jp
authors.forename: Masahiro
authors.initials: M
authors.lastname: Moriyama
authors.forename: Atsuya
authors.initials: A
authors.lastname: Kawaguchi
authors.forename: Masaki
authors.initials: M
authors.lastname: Yokokawa
authors.forename: Shin
authors.initials: S
authors.lastname: Ikeda
authors.forename: Hajime
authors.initials: H
authors.lastname: Kitagaki
authors.forename: Nobue
authors.initials: N
authors.lastname: Uchida
mesh_terms: D003198:Computer Simulation; D004566:Electrodes; D004867:Equipment Design; D006801:Humans; D006979:Hyperthermia, Induced / Q000295:instrumentation*; D009055:Mouth / Q000473:pathology*; D009062:Mouth Neoplasms / Q000628:therapy*; D011846:Radio Waves