临床医师的物理学：液体衰减反转恢复（FLAIR）和双反转恢复（DIR）成像。
Physics for clinicians: Fluid-attenuated inversion recovery (FLAIR) and double inversion recovery (DIR) Imaging.
机构信息
Department of Medical Imaging, University of Arizona, Tucson, Arizona, USA.
GE Healthcare, Menlo Park, California, USA.
出版信息
J Magn Reson Imaging. 2017 Dec;46(6):1590-1600. doi: 10.1002/jmri.25737. Epub 2017 Apr 17.
UNLABELLED
A pedagogical review of fluid-attenuated inversion recovery (FLAIR) and double inversion recovery (DIR) imaging is conducted in this article. The basics of the two pulse sequences are first described, including the details of the inversion preparation and imaging sequences with accompanying mathematical formulae for choosing the inversion time in a variety of scenarios for use on clinical MRI scanners. Magnetization preparation (or T2prep), a strategy for improving image signal-to-noise ratio and contrast and reducing T weighting at high field strengths, is also described. Lastly, image artifacts commonly associated with FLAIR and DIR are described with clinical examples, to help avoid misdiagnosis.
LEVEL OF EVIDENCE
5 Technical Efficacy: Stage 2 J. Magn. Reson. Imaging 2017;46:1590-1600.
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本文对液体衰减反转恢复（FLAIR）和双反转恢复（DIR）成像进行了教学审查。首先描述了这两种脉冲序列的基础知识，包括反转准备和成像序列的详细信息，以及在各种情况下选择反转时间的数学公式，以便在临床 MRI 扫描仪上使用。还描述了磁化准备（或 T2prep），这是一种提高图像信噪比和对比度并降低高场强下 T 权重的策略。最后，通过临床实例描述了与 FLAIR 和 DIR 相关的常见图像伪影，以帮助避免误诊。
证据水平
5 技术功效：第 2 阶段 J. 磁共振成像 2017；46：1590-1600.
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