磁共振成像交替阻抗微带线射频线圈仿真分析  

Simulation of alternating impedance microstrip RF coils for MRI

作　　者：张鞠成 徐冰俏[1] 李霞[1,2] 陶贵生[1,2] 徐文龙[1] 

机构地区：[1]中国计量学院信息工程学院,浙江杭州310018 [2]浙江大学生物医学工程与仪器科学学院,浙江杭州310027

出　　处：《中国计量学院学报》2013年第1期40-43,76,共5页Journal of China Jiliang University

基　　金：国家自然科学基金资助项目(No.81101031;30900332);国家质检公益性行业科研资助项目(No.201210097);浙江省科技厅项目(No.2010C14010);浙江省新苗人才计划项目(No.2012R409043)

摘　　要：为研究改变交替阻抗微带线射频线圈的几何尺寸对感兴趣区内磁场分布的影响,保持微带线射频线圈总长度不变,改变宽带与窄带的长度比例和宽度比例,在HFSS中建立交替阻抗微带线射频线圈的仿真模型,与传统微带线射频线圈进行比较,利用ADS与HFSS的协同仿真实现线圈的调谐和匹配.仿真结果表明交替阻抗微带线射频线圈感兴趣区内的磁场均值比传统微带线射频线圈的提高了一倍以上.调整交替阻抗微带线射频线圈的宽带与窄带的长度比例和宽度比例,可以提高感兴趣区内的磁场强度,同时改善磁场分布的均匀性.This paper studied the impact of modifying the geometric parameters of alternating impedance microstrip radio frequency(RF) coils on magnetic field distribution in regions of interest.Keeping the total length of microstrip RF coils unchanged,we altered the ratio of the length and the width of both the thick and the thin sections.Simulation models in HFSS were then built and compared with conventional microstrip RF coils.Coils were tuned and matched to 50 Ω coaxial cable with ADS and HFSS co-simulation.The results showed that the mean magnetic field intensity of alternating impedance microstrip RF coils in regions of interest was twice above that of conventional microstrip coils.Fine adjustment of the length ratio and the width ratio of the thick and the thin sections of alternating impedance microstrip RF coils can increase magnetic field intensity and improve the uniformity of magnetic field distributions.

关 键 词：磁共振成像 交替阻抗 微带线 射频线圈 

分 类 号：R445.2[医药卫生—影像医学与核医学] TL62+2[医药卫生—诊断学]