Chen Zhichao, Solbach Klaus, Erni Daniel, Rennings Andreas
IEEE Trans Biomed Eng. 2017 Jun;64(6):1297-1304. doi: 10.1109/TBME.2016.2602441. Epub 2016 Aug 25.
In this contribution, we investigate the [Formula: see text] distribution and coupling characteristics of a multichannel radio frequency (RF) coil consisting of different dipole coil elements for 7 T MRI, and explore the feasibility to achieve a compromise between field distribution and decoupling by combining different coil elements. Two types of dipole elements are considered here: the meander dipole element with a chip-capacitor-based connection to the RF shield which achieves a sufficient decoupling between the neighboring elements; and the open-ended meander dipole element which exhibits a broader magnetic field distribution. By nesting the open-ended dipole elements in between the ones with end-capacitors, the [Formula: see text] distribution, in terms of field penetration depth and homogeneity, is improved in comparison to the dipole coil consisting only of the elements with end-capacitors, and at the same time, the adjacent elements are less coupled to each other in comparison to the dipole coil consisting only of the open-ended elements. The proposed approach is validated by both full-wave simulation and experimental results.
在本论文中，我们研究了用于7T磁共振成像（MRI）的由不同偶极线圈元件组成的多通道射频（RF）线圈的[公式：见正文]分布和耦合特性，并探讨了通过组合不同线圈元件在磁场分布和解耦之间达成折衷的可行性。这里考虑了两种类型的偶极元件：一种是采用基于芯片电容器连接到射频屏蔽的曲折偶极元件，它能在相邻元件之间实现充分的去耦；另一种是开口端曲折偶极元件，其具有更宽的磁场分布。通过将开口端偶极元件嵌套在带有端电容的偶极元件之间，与仅由带有端电容的元件组成的偶极线圈相比，在磁场穿透深度和均匀性方面，[公式：见正文]分布得到了改善，同时，与仅由开口端元件组成的偶极线圈相比，相邻元件之间的耦合也更少。所提出的方法通过全波模拟和实验结果得到了验证。
