Objective: In order to improve the performance of the Bl field of MR radio frequency coil, to calculate the complex coil-tissue electromagnetic interactions, the method of establishing human three-dimensional electromagnetic model is introduced. The proposed model is used as load to improve the performance of the Bl field. Methods: Based on CT scanning images, the 3D model was reconstructed by a precise manual segmentation and volume rendering three-dimensional reconstruction method. The final real human three-dimensional electromagnetic model was built combining the geometrical model and the dielectric properties of different tissues. The established model was set into the FDTD domain inside the Bl field as the load to optimize the Bl field. Results: The real human three-dimensional electromagnetic model was established successfully and applied to the simulation of RF coil in MR. Conclusions: The real human three-dimensional electromagnetic model is powerful to optimize the Bl field of RF coil. The proposed modeling method can be used to establish model of other parts of human body and the established model is meaningful for the optimization of the RF coil.%目的:为了提高MR射频线圈B1场性能,解决射频线圈与人体组织复杂电磁作用问题,提出真实人体三维电磁模型建立方法,并将建立的真实人体三维电磁模型作为负载,优化MR射频线圈B1场分布.方法:以人体CT断层扫描图像为基础,采用精确的人工分割方式和体绘制三维重建方法,并结合不同组织相应的电磁参数,建立真实人体三维电磁模型,作为B1场FDTD域负载.结果:成功建立了真实人体三维电磁模型,实现了对射频线圈B1场的优化.结论:运用建立的真实人体三维电磁模型,能有效优化MR射频线圈B1场分布.提出的建模方法适合建立人体其他部位电磁模型,对优化MR射频线圈设计有重要意义.
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