射频线圈设计中盆腔组织对电磁场影响研究  

Research of the Influences on the Electromagnetic Fields by the Pelvic Tissues in the Design of the Radio Frequency Coils

作　　者：韩继钧[1] 李岩[2] 辛学刚[1] 

机构地区：[1]南方医科大学生物医学工程学院,广州510515 [2]南方医科大学附属珠江医院肿瘤中心,广州510280

出　　处：《生物医学工程学杂志》2013年第4期849-853,共5页Journal of Biomedical Engineering

基　　金：国家自然科学基金面上项目资助(61172034)

摘　　要：针对人体盆腔组织复杂电磁特性对磁共振射频磁场的影响,运用时域有限差分(FDTD)方法进行电磁仿真计算。通过该方法,在建立人体盆腔电磁模型的基础上,定量分析盆腔组织电磁模型对成像均匀性的影响。本文首先构建人体形态模型,然后对相应区域赋以电磁参数构成电磁模型,最后采用有限差分方法进行仿真计算。仿真结果证明人体盆腔在射频磁场下会与射频线圈发生严重耦合,破坏磁场均匀性,从而降低成像质量。该研究为以后的磁共振射频线圈设计奠定了基础。In the present study,the effect of the electromagnetic field,induced by radio frequency（RF） coils and coupled with the pelvic tissues,was calculated with the method of finite difference time domain（FDTD）.Using the established electromagnetic model of human pelvis region,the simulation was implemented.The imaging uniformity was quantitatively calculated and scaled with the values of the percentage image uniformity（PIU）.The electromagnetic model was derived from the anatomical data of human pelvic region and loaded into the simulation.The results showed that the homogeneity of the magnetic fields was severely damaged due to the coupling between the RF coil and the human tissues when loaded with the human pelvis in the Birdcage RF coils at 3T.The research results set a basis meaningful for the design of RF coils.

关 键 词：时域有限差分方法 磁共振成像 射频线圈 

分 类 号：R445.2[医药卫生—影像医学与核医学]