损耗介质透镜实现皮秒脉冲电场在乳房组织模型中的聚焦

Focusing of Picosecond Pulsed Electric Fields in Breast Tissue Model with Lossy Dielectric Lens

为实现ps脉冲电场(ps PEF)经冲激脉冲辐射天线(IRA)发射后在近似实际乳房组织(电导率为0.5 S/m)模型中的有效聚焦,采用计算机仿真技术(CST)Microwave studio软件构建了天线及乳房组织模型并计算了ps PEF在其中的聚焦特性。结果表明:引入优化参数的损耗介质材料(厚度为1 cm,电导率为10 S/m)衰减小路径角电场,最终能够实现ps PEF在焦点F2处的聚焦(电场强度E=0.08 V/m);损耗材料的引入使得焦点F2处的电场强度大大减小,引入损耗介质透镜,不仅实现了ps PEF在乳房组织模型中的良好聚焦,而且焦点F2处的电场强度(E=0.45 V/m)大大增强。因此,优化设计的损耗介质透镜能够实现ps PEF在生物组织中的有效聚焦。

To effectively focusing picoseconds pulsed electric fields（ps PEF） in approximate actual breast tissue（with conductivity of 0.5 S/m） using impulse radiating antenna（IRA）, we established models of IRA and breast tissue in computer simulation technology（CST） Microwave studio and calculated the focusing properties of ps PEF in the models. The results indicate that by introducing optimized lossy dielectric materials（1-cm thick with conductivity of 10 S/m） to attenuate the electric field of small path angle, we successfully focused ps PEF at the focal point F2. The introduction of lossy materials greatly reduced the field intensity at F2（E=0.08 V/m）, thus we developed lossy dielectric lens which helped to focus ps PEF in breast tissue model while ensuring large field intensity at F2（E=0.45 V/m）. In conclusion, using optimized designed lossy dielectric lens is effective in focusing ps PEF in biological tissues.