Metamaterial structures for MR-spectroscopy - Metacoils

超材料谐振器能否解决高场（7T）磁共振成像中出现的主要挑战？在这些场强下，拉莫尔频率的增加导致感兴趣区域的射频（RF）波长。由此产生的磁共振图像存在伪影，并且患者可能暴露于不安全的特定吸收率（SAR）水平。超材料可以利用零阶共振，改善沿谐振腔的场均匀性，这一特性可能会规避这些关键的高场问题。最近的研究表明，超材料能够在磁共振（MR）设置中引导射频。为了使基于超材料的MR线圈（我们称之为MetaCoils）在磁共振成像领域站稳脚跟，我们将进行基础研究，以解释其理论性能和实际局限性。此外，我们将在高场环境中创造有关其设计，制造和性能的知识，并将获得的结果转化为实际的设计规则。

Can metamaterial resonators solve the major challenges that arise in high field (7T) magnetic resonance imaging? At these field strengths, the increase Larmor frequency leads to radiofrequency (RF) wavelengths of the order of the region of interest. The resultant magnetic resonance image suffers from artifacts, and patients can be exposed to unsafe specific absoption rate (SAR) levels.Metamaterials can exploit zero order resonances with improved field homogeneity along the resonator, a feature which potentially can circumvent these critical high-field issues. Recent studies have shown that metamaterials are capable of guiding RF in a magnetic resonance (MR) setting. In order for metamaterial-based MR coils - or MetaCoils as we call them here - to become firmly established in magnetic resonance imaging, we will perform fundamental investigations to explain their theoretical performance and practical limitations. Furthermore, we will create knowledge on their design, manufacture, and performance in a high field setting, and cast the gained results into practical design rules.