Zhang Xiaoliang, Zhu Xiao-Hong, Chen Wei
Center for Magnetic Resonance Research, Department of Radiology, University of Minnesota Medical School, Minneapolis, 55455, USA.
Magn Reson Med. 2005 May;53(5):1234-9. doi: 10.1002/mrm.20462.
A novel concept based on the use of higher-order harmonic resonances in a transmission-line resonator is introduced for the design of high-frequency RF coils at high and ultrahigh fields, where conventional RF coil designs present difficulties and limitations. To demonstrate this concept, we successfully designed and fabricated a 400-MHz RF coil for rat imaging using a second-harmonic resonant microstrip transmission line. This coil has a high Q-factor, reduces coil-cable interactions without the use of a matching balun, and has a broad range for tuning the coil's resonant frequency at the loaded condition. This work demonstrates that the use of higher-order harmonics in a transmission-line resonator provides an alternative, efficient approach to the design of large and high-frequency RF coils.
本文介绍了一种基于传输线谐振器中高阶谐波共振的新颖概念，用于在高场和超高场下设计高频射频线圈，而传统射频线圈设计在此存在困难和局限性。为了验证这一概念，我们成功设计并制造了一个用于大鼠成像的400MHz射频线圈，该线圈采用二次谐波谐振微带传输线。该线圈具有高Q值，无需使用匹配巴伦即可减少线圈与电缆的相互作用，并且在加载条件下具有宽范围的线圈谐振频率调谐能力。这项工作表明，在传输线谐振器中使用高阶谐波为大型高频射频线圈的设计提供了一种替代的有效方法。
