7T MR Safety.
7T MR Safety.
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DOI：
10.1002/jmri.27319
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发表时间：
2021-03
期刊：
影响因子：
--
通讯作者：
ISMRM Safety Committee
中科院分区：
文献类型：
--
作者：
Fagan AJ;Bitz AK;Björkman-Burtscher IM;Collins CM;Kimbrell V;Raaijmakers AJE;ISMRM Safety Committee
7 T磁共振成像和波谱（MRI/MRS）代表了MR技术令人兴奋的进步，具有增强图像空间，光谱和对比度分辨率的有趣可能性。为了确保这项技术的安全使用，同时仍然利用其潜力，临床工作人员和研究人员需要认识到由于磁场强度增加和拉莫尔频率提高而引起的一些安全问题。较高的静磁场会增强瞬时生物效应，并增加与导电植入物相关的不良事件风险。许多技术挑战仍然存在，7 T MRI/MRS的持续快速发展可能会在未来几年内为确保该技术的安全性带来进一步的挑战。最近对7 T临床诊断成像的监管许可可能会增加7 T系统的安装基础，特别是在之前几乎没有超高场MR经验的医院环境中。需要进行知情的风险/受益分析，特别是在无法获得植入物制造商发布的7 T植入物安全指南的情况下。代表国际医学磁共振学会，本文的目的是提供一个参考文件，以帮助机构制定当地的机构政策和程序，具体到安全操作的7 T MRI/MRS。目前的7 T技术的细节和物理基础的功能进行审查，目的是支持在研究和临床环境中扩大7 T MRI/MRS的使用。还查明了目前在知识方面的差距，需要在这些方面进行更多的研究和开发。
Magnetic resonance imaging and spectroscopy (MRI/MRS) at 7T represents an exciting advance in MR technology, with intriguing possibilities to enhance image spatial, spectral, and contrast resolution. To ensure the safe use of this technology while still harnessing its potential, clinical staff and researchers need to be cognizant of some safety concerns arising from the increased magnetic field strength and higher Larmor frequency. The higher static magnetic fields give rise to enhanced transient bioeffects and an increased risk of adverse incidents related to electrically conductive implants. Many technical challenges remain and the continuing rapid pace of development of 7T MRI/MRS is likely to present further challenges to ensuring safety of this technology in the years ahead. The recent regulatory clearance for clinical diagnostic imaging at 7T will likely increase the installed base of 7T systems, particularly in hospital environments with little prior ultrahigh-field MR experience. Informed risk/benefit analyses will be required, particularly where implant manufacturer-published 7T safety guidelines for implants are unavailable. On behalf of the International Society for Magnetic Resonance in Medicine, the aim of this article is to provide a reference document to assist institutions developing local institutional policies and procedures that are specific to the safe operation of 7T MRI/MRS. Details of current 7T technology and the physics underpinning its functionality are reviewed, with the aim of supporting efforts to expand the use of 7T MRI/MRS in both research and clinical environments. Current gaps in knowledge are also identified, where additional research and development are required.
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