Fujiwara Yasuhiro, Ishimori Yoshiyuki, Yamaguchi Isao, Matsuda Tsuyoshi, Miyati Tosiaki, Kimura Hirohiko
Department of Radiology, Fukui University Hospital, and Faculty of Medical Sciences, University of Fukui.
Nihon Hoshasen Gijutsu Gakkai Zasshi. 2008 Dec 20;64(12):1513-21. doi: 10.6009/jjrt.64.1513.
The purpose of this study was to suppress CSF flow artifacts in the fast FLAIR sequence at 3.0T MRI. We investigated the influence of thickness of the inversion pulse in the sequence on the high-intensity CSF flow artifacts based on the flow phantom and in-vivo studies at 1.5T and 3.0T. Results demonstrated that CSF flow artifacts at 3.0T were clearly stronger than at as 1.5T. Moreover, 3.0T was influenced by the crosstalk between each inversion pulse compared with 1.5T. The optimal setting of inversion pulse for two interleaving acquisitions for fast FLAIR imaging at 3.0T was approximately 1.5 fold on the basis of sum of slice thickness and slice gap. The appropriate setting of thickness of inversion pulse in fast FLAIR imaging reduces the incidence of CSF flow artifacts at 3.0T.
本研究的目的是在3.0T磁共振成像（MRI）的快速液体衰减反转恢复（FLAIR）序列中抑制脑脊液（CSF）流动伪影。我们基于流动模型以及在1.5T和3.0T下的体内研究，探讨了该序列中反转脉冲厚度对高强度CSF流动伪影的影响。结果表明，3.0T时的CSF流动伪影明显强于1.5T时。此外，与1.5T相比，3.0T受每个反转脉冲之间串扰的影响更大。在3.0T下进行快速FLAIR成像的两次交错采集时，反转脉冲的最佳设置约为层厚与层间距之和的1.5倍。在快速FLAIR成像中适当设置反转脉冲厚度可降低3.0T时CSF流动伪影的发生率。
Zotero 插件