Department of Radiology, Leiden University Medical Center, Leiden, Netherlands.
Department of Nanophotonics and Metamaterials, ITMO University, St. Petersburg, Russia.
Sci Rep. 2017 May 10;7(1):1678. doi: 10.1038/s41598-017-01932-9.
Developments in metamaterials and related structures such as metasurfaces have opened up new possibilities in designing materials and devices with unique properties. Here we report a new hybrid metasurface structure, comprising a two-dimensional metamaterial surface and a very high permittivity dielectric substrate, that has been designed to enhance the local performance of an ultra-high field MRI scanner. This new flexible and compact resonant structure is the first metasurface which can be integrated with multi-element close-fitting receive coil arrays that are used for all clinical MRI scans. We demonstrate the utility of the metasurface acquiring in-vivo human brain images and proton MR spectra with enhanced local sensitivity on a commercial 7 Tesla system.
超材料和相关结构（如超表面）的发展为设计具有独特性能的材料和器件开辟了新的可能性。在这里，我们报告了一种新的混合超表面结构，它由二维超材料表面和非常高介电常数的介电基底组成，旨在增强超高场 MRI 扫描仪的局部性能。这种新的灵活紧凑的共振结构是第一个可以与用于所有临床 MRI 扫描的多元素紧密贴合接收线圈阵列集成的超表面。我们在商业 7 特斯拉系统上展示了超表面在获取体内人脑图像和质子磁共振谱方面的应用，其局部灵敏度得到了增强。
