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本文描述了一种热发生器设计方法,它运用时域的有限差分方法(FDTD)并结合图形显示电场和归一化线性温度上升。该方法宁可计算而不假设天线电流的分布,包括人体与发生器之间的相互作用,并计算了趋动点阻抗和发生器分配功率。结果表明二维电类型发生器的一个重要限制是电场常用元件引起脂肪过热,它是由于附近场和肌肉耦合电容的存在。影响电容量的两个因素是肌肉的导电率和空气中小型天线的大小。本文又提出了避免脂肪过热而设计的两种发生器:一种27MHz的偶极用于加热大肿瘤达7cm深,及一种用于小
This article describes a thermal generator design approach that uses finite-difference time-domain (FDTD) in combination with a graphical display of the electric field and a normalized linear temperature rise. Instead of assuming the distribution of antenna currents, including the interaction between the human body and the generator, the method rather calculates and calculates the impedance of the moving point and the generator distributed power. The result shows that one of the most important limitations of the two-dimensional electric generator is that the common components of the electric field cause the fat to overheat, which is due to the presence of nearby field and muscle coupling capacitances. Two factors that affect capacitance are muscle conductivity and the size of small airborne antennas. This article also presents two generators designed to avoid overheating of fat: a 27 MHz dipole to heat large tumors up to 7 cm deep, and one for small