Radiofrequency coil for routine ultra‐high‐field imaging with an unobstructed visual field,NMR in Biomedicine

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Radiofrequency coil for routine ultra‐high‐field imaging with an unobstructed visual field
NMR in Biomedicine ( IF 2.7 ) Pub Date : 2020-12-10 , DOI: 10.1002/nbm.4457
Kyle M Gilbert _{1,

2} , L Martyn Klassen ₁ , Alexander Mashkovtsev ₁ , Peter Zeman ₁ , Ravi S Menon _{1,

2} , Joseph S Gati _{1,

2}

Affiliation

Many neuroscience applications have adopted functional MRI as a tool to investigate the healthy and diseased brain during the completion of a task. While ultra‐high‐field MRI has allowed for improved contrast and signal‐to‐noise ratios during functional MRI studies, it remains a challenge to create local radiofrequency coils that can accommodate an unobstructed visual field and be suitable for routine use, while at the same time not compromise performance. Performance (both during transmission and reception) can be improved by using close‐fitting coils; however, maintaining sensitivity over the whole brain often requires the introduction of coil elements proximal to the eyes, thereby partially occluding the subject's visual field. This study presents a 7 T head coil, with eight transmit dipoles and 32 receive loops, that is designed to remove visual obstructions from the subject's line of sight, allowing for an unencumbered view of visual stimuli, the reduction of anxiety induced from small enclosures, and the potential for eye‐tracking measurements. The coil provides a practical solution for routine imaging, including a split design (anterior and posterior halves) that facilitates subject positioning, including those with impaired mobility, and the placement of devices required for patient comfort and motion reduction. The transmit and receive coils displayed no degradation of performance due to adaptions to the design topology (both mechanical and electrical) required to create an unobstructed visual field. All computer‐aided design files, electromagnetic simulation models, transmit field maps and local specific absorption rate matrices are provided to promote reproduction.

中文翻译：

用于无障碍视野的常规超高场成像的射频线圈

许多神经科学应用已采用功能性 MRI 作为工具，在完成任务期间调查健康和患病的大脑。虽然超高场 MRI 已经允许在功能性 MRI 研究期间提高对比度和信噪比，但创建可以容纳无障碍视野并适合常规使用的局部射频线圈仍然是一个挑战，而在同时不影响性能。使用紧密配合的线圈可以提高性能（在传输和接收期间）；然而，保持整个大脑的灵敏度通常需要在眼睛附近引入线圈元件，从而部分遮挡受试者的视野。本研究展示了一个 7 T 头部线圈，具有 8 个发射偶极子和 32 个接收回路，旨在消除受试者视线中的视觉障碍物，允许不受阻碍地观察视觉刺激，减少小围栏引起的焦虑，并有可能进行眼动追踪测量。该线圈为常规成像提供了实用的解决方案，包括便于对象定位（包括行动不便的对象）的分体式设计（前半部分和后半部分），以及放置患者舒适度和减少运动所需的设备。由于适应了创建无障碍视野所需的设计拓扑（机械和电气），发射和接收线圈的性能没有下降。所有计算机辅助设计文件、电磁仿真模型、

更新日期：2021-02-04

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