Radiofrequency Coils for 7 Tesla MRI.
Radiofrequency Coils for 7 Tesla MRI.
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DOI：
10.1097/rmr.0000000000000206
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发表时间：
2019-06-01
期刊：
影响因子：
--
通讯作者：
Quick, Harald H
中科院分区：
文献类型：
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作者：
Kraff, Oliver;Quick, Harald H
射频（RF）线圈是磁共振（MR）系统的重要组成部分。为了利用超高频磁场（UHF）固有的较高信噪比，研究中心被迫建立射频线圈开发方面的专业知识，因为市售射频线圈的数量有限。此外，由于技术和物理限制，在较低场强的MR系统中已确立的集成发射体RF线圈在UHF下仍然缺失。这篇综述文章简要概括了射频特性和射频线圈，介绍了术语和射频相关参数，然后将全面概述当前用于7 T从头到脚MRI的最先进射频线圈。最后，关于射频安全性的章节将简要讨论对定制设计的射频线圈进行安全性评估的挑战，以及射频场与潜在植入医疗器械相互作用引起的问题。
Radiofrequency (RF) coils are an essential part of the magnetic resonance (MR) system. To exploit the inherently higher signal-to-noise ratio at ultrahigh magnetic fields (UHF), research sites were forced to build up expertise in RF coil development, as the number of commercially available RF coils were limited. In addition, an integrated transmit body RF coil, which is well-established at MR systems of lower field strength, is still missing at UHF due to technical and physical constraints. This review article provides a brief recapitulation of RF characteristics and RF coils in general to introduce terminology and RF-related parameters, and will then provide an extensive overview of current state-of-the-art RF coils used for MRI from head to toe at 7 Tesla. Finally, a section on RF safety will briefly discuss challenges in performing a safety assessment for custom-designed RF coils, and issues arising from the interaction of the RF field and potentially implanted medical devices.