Kato H, Hand J W, Prior M V, Furukawa M, Yamamoto O, Ishida T
Department of Radiology, Shimaue Medical University, Izumo, Japan.
IEEE Trans Biomed Eng. 1991 Jul;38(7):644-7. doi: 10.1109/10.83563.
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.
提出了一种控制射频热疗中比吸收率（SAR）分布的方法。与电容耦合电极相关的电流密度和与H场耦合感应孔径型 applicators相关的电流密度叠加，改变了加热材料中的实际电流分布。使用二维有限元方法，我们已经表明“聚焦”是可能的，这样即使波长远大于体模尺寸，体模中心的SAR也可以被调整为大约是表面区域的两倍。
