Boag A, Leviatan Y
Department of Electrical Engineering, Technion-Israel Institute of Technology, Haifa.
IEEE Trans Biomed Eng. 1990 Oct;37(10):987-95. doi: 10.1109/10.102811.
A method is proposed for determining the excitation amplitudes and phases of the elements of electromagnetic multiapplicator systems for optimizing the specific absorption rate (SAR) distribution around a deep-seated tumor. In this method, the ratio of the power dissipated in the tumor to a weighted summation of the powers supplied to the surrounding regions is optimized. The optimization procedure is combined with a recently proposed effective technique for analysis of various electromagnetic scattering and interaction problems. The general principle is applied to a two-dimensional problem of a piecewise homogeneous cylinder heated by an array of electric current filaments placed outside the cylinder. Numerical simulations are performed to check the effectiveness of the approach. The results demonstrate that using this optimization method, improved SAR distributions can be achieved. The extension to three-dimensional configurations is discussed.
提出了一种确定电磁多辐射器系统元件的激励幅度和相位的方法，用于优化深部肿瘤周围的比吸收率（SAR）分布。在该方法中，优化肿瘤中耗散的功率与供应给周围区域的功率的加权总和之比。优化过程与最近提出的用于分析各种电磁散射和相互作用问题的有效技术相结合。将该一般原理应用于由放置在圆柱体外部的电流丝阵列加热的分段均匀圆柱体的二维问题。进行了数值模拟以检验该方法的有效性。结果表明，使用这种优化方法可以实现更好的SAR分布。还讨论了向三维配置的扩展。
