Petropoulos L S, Haacke E M, Brown R W, Boerner E
Department of Physics, Case Western Reserve University, Cleveland, Ohio.
Magn Reson Med. 1993 Sep;30(3):366-72. doi: 10.1002/mrm.1910300315.
We present preliminary results for a 3D finite element calculation to evaluate RF penetration in conducting dielectric materials at high field strengths. A tetrahedral mesh is used along with a Coulomb gauge constraint in a finite element method that yields excellent numerical stability at high frequencies. Accuracy is verified by comparisons with analytic solutions for single-layer and multiple-layer heterogeneous systems and for a 3D spherical model. We have also compared the finite element model with experimental results presented by Foo et al., Magn. Reson. Med. 23, (1992). Agreement is very good and argues for the usefulness of the method in the calculation of RF penetration and RF power deposition effects in heterogeneous objects.
我们展示了一项三维有限元计算的初步结果，用于评估高场强下导电介电材料中的射频穿透情况。在有限元方法中使用四面体网格并结合库仑规范约束，该方法在高频下具有出色的数值稳定性。通过与单层和多层异质系统以及三维球形模型的解析解进行比较来验证准确性。我们还将有限元模型与Foo等人于1992年发表在《磁共振医学》第23卷上的实验结果进行了比较。两者吻合度非常高，这表明该方法在计算异质物体中的射频穿透和射频功率沉积效应方面是有用的。
