Head Motion Detection Using FID Navigators
Head Motion Detection Using FID Navigators
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DOI：
10.1002/mrm.22797
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发表时间：
2011-07-01
影响因子：
3.3
通讯作者：
Krueger, Gunnar
中科院分区：
文献类型：
--
作者：
Kober, Tobias;Marques, Jose P.;Krueger, Gunnar
这项工作探讨了一个概念，在大脑MR检查中使用高通道数RF线圈阵列的运动检测。它应用超短（< 100 μ sec）自由感应衰减信号，利用运动在与参考自由感应衰减信号相比时在这些信号中引起变化的知识。作为概念验证，该方法在标准结构MRI序列中实现。在体模实验中验证了自由感应衰减信号的稳定性。人体实验表明，所观察到的导航数据的变化提供了一个敏感的措施，检测相关的和共同的主题运动模式。所提出的方法提供了一种在整个MRI扫描过程中监测受试者运动的方法，同时对序列时序和图像对比度产生很小或没有影响。因此，它可以补充可用的运动检测和校正方法，从而进一步降低MR应用中的运动灵敏度。Magn Reson Med 66：135-143，2011. (C)2011 Wiley-Liss，Inc.
This work explores a concept for motion detection in brain MR examinations using high channel-count RF coil arrays. It applies ultrashort (< 100 mu sec) free induction decay signals, making use of the knowledge that motion induces variations in these signals when compared to a reference free induction decay signal. As a proof-of-concept, the method was implemented in a standard structural MRI sequence. The stability of the free induction decay-signal was verified in phantom experiments. Human experiments demonstrated that the observed variations in the navigator data provide a sensitive measure for detection of relevant and common subject motion patterns. The proposed methodology provides a means to monitor subject motion throughout a MRI scan while causing little or no impact on the sequence timing and image contrast. It could hence complement available motion detection and correction methods, thus further reducing motion sensitivity in MR applications. Magn Reson Med 66:135-143, 2011. (C) 2011 Wiley-Liss, Inc.