一种平面射频发射线圈的电磁特性分析  

Electromagnetic characteristic analysis of a planar transmit coil

作　　者：魏树峰[1,2] 杨文晖[1] 王慧贤[1] 

机构地区：[1]中国科学院电工研究所,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《电工电能新技术》2012年第4期15-18,共4页Advanced Technology of Electrical Engineering and Energy

基　　金：国家自然科学基金青年基金资助项目(50807050)

摘　　要：对一种应用在垂直场磁共振成像系统上的平面射频发射线圈进行了分析研究。首先用集中参数的等效电路模型对线圈的谐振频率及谐振模式进行了理论分析,在此基础上利用电磁场数值计算的方法对这种线圈在不同的谐振模式下的电流分布及磁场分布进行了研究。最后还对一个分成8段的平面射频发射线圈的射频场的空间分布进行了仿真。结果表明,这种线圈在300 mm的球内,磁场强度偏离中心点最大不超过15.2%,计算结果与实测结果是吻合的。A planar RF coil used in vertical field MRI was analyzed in this paper. Firstly, a lumped element equivalent circuit of the planar coil was used to analyze the resonant frequency and resonant mode of the coil. Then current distribution and magnetic field distribution in different resonant modes were studied with the method of numerical calculation of electromagnetic fields. Finally, a planar transmit coil with 8 segments was analyzed. The homogeneity of the coil in a sphere of 300 mm in diameter is 15.2% , and this is close to the results measured on a real coil.

关 键 词：磁共振成像(MRI) 射频线圈 垂直场 电磁场数值计算 

分 类 号：TM153.5[电气工程—电工理论与新技术]