Depto. Electromagnetismo y F. de la Materia Facultad de Ciencias University of Granada Avda. Fuentenueva E-18071, Spain.
Phys Med Biol. 2010 Jun 7;55(11):3087-100. doi: 10.1088/0031-9155/55/11/007. Epub 2010 May 12.
Boundary element methods represent a valuable approach for designing gradient coils; these methods are based on meshing the current carrying surface into an array of boundary elements. The temporally varying magnetic fields produced by gradient coils induce electric currents in conducting tissues and so the exposure of human subjects to these magnetic fields has become a safety concern, especially with the increase in the strength of the field gradients used in magnetic resonance imaging. Here we present a boundary element method for the design of coils that minimize the electric field induced in prescribed conducting systems. This work also details some numerical examples of the application of this coil design method. The reduction of the electric field induced in a prescribed region inside the coils is also evaluated.
边界元法是设计梯度线圈的一种有效方法；这些方法基于将载流表面网格化为边界元的阵列。梯度线圈产生的时变磁场会在导电组织中感应出电流，因此，人体暴露于这些磁场中已成为一个安全问题，尤其是在磁共振成像中使用的场梯度强度增加的情况下。在这里，我们提出了一种边界元方法，用于设计可以使预定导电系统中感应的电场最小化的线圈。这项工作还详细介绍了这种线圈设计方法的一些数值应用实例。还评估了在线圈内部预定区域中感应的电场的减小。
