Control of specific absorption rate distribution using capacitive electrodes and inductive aperture-type applicators: implications for radiofrequency hyperthermia.
A method of controlling the specific absorption rate (SAR) distribution in radiofrequency hyperthermia is proposed. The superposition of the current density associated with capacitively coupled electrodes and that associated with H-field coupled inductive aperture-type applicators modifies the actual current distribution in the heating material. Using a two-dimensional finite element method, we have shown that "focusing" is possible such that the SAR at the center of a phantom can be adjusted to be approximately twice that in superficial regions, even though the wavelength is considerably greater than the dimensions of the phantom.
Kato
H
H
Department of Radiology, Shimaue Medical University, Izumo, Japan.
Hand
J W
JW
Prior
M V
MV
Furukawa
M
M
Yamamoto
O
O
Ishida
T
T
D004553:Electric Conductivity; D004566:Electrodes; D006979:Hyperthermia, Induced / Q000295:instrumentation*; D008961:Models, Structural; D008962:Models, Theoretical; D011846:Radio Waves