Reyhani S M S, Ludwig Simone A
Department of Information Systems and Computing, Brunel University, Uxbridge, Middlesex UB8 3PH, UK.
IEEE Trans Biomed Eng. 2006 Oct;53(10):2092-101. doi: 10.1109/TBME.2006.881770.
Can cellular phones and personal communication systems base station antennas affect the active or passive implantable medical devices adversely? Concerns over the possible harmful effects of nonionizing irradiaton upon implanted medical devices have been present for many years. Key issues to address are the questions of whether mobile phones have a detrimental effect on implants, and how the interaction of the handset with the body can be minimized in order to both alleviate public fears and improve handset antenna performance and new implant designs. This paper presents a thorough investigation of the scattering of an electromagnetic (EM) wave from a perfectly conducting implant (a cylindrical wire and a very thin cylindrical disk) of electrically small radius (of resonant length), embedded eccentrically into a dielectric spherical head model by a dipole antenna (0.4 wavelength) at 900 MHz. The dyadic Green's function (DGF) for spherical vector wave functions is employed. Analytical expressions for the scattered fields of an implant embedded head model is obtained. Numerical results from analytical expressions are computed for this problem and then compared with the results from the same model using the finite-difference time-domain, EMU-FDTD electromagnetic simulator. Good agreement is observed between the analytical results on the proposed method in comparison with the FDTD method.
蜂窝电话和个人通信系统基站天线会对有源或无源植入式医疗设备产生不利影响吗？多年来，人们一直担心非电离辐射对植入式医疗设备可能产生的有害影响。需要解决的关键问题包括移动电话是否会对植入物产生有害影响，以及如何将手机与身体之间的相互作用降至最低，以便既能减轻公众的担忧，又能提高手机天线性能和改进新型植入物设计。本文对一个半径很小（谐振长度）的理想导电植入物（圆柱形导线和非常薄的圆柱形圆盘）在900兆赫兹时被偶极天线（0.4波长）偏心嵌入到一个介质球形头部模型中所产生的电磁波散射进行了全面研究。采用了用于球矢量波函数的并矢格林函数（DGF）。得到了植入物嵌入头部模型散射场的解析表达式。针对此问题计算了解析表达式的数值结果，然后将其与使用有限差分时域电磁模拟器EMU-FDTD对同一模型得到的结果进行比较。在所提出方法的解析结果与FDTD方法之间观察到了良好的一致性。
