Mazzoli Valentina, Nederveen Aart J, Oudeman Jos, Sprengers Andre, Nicolay Klaas, Strijkers Gustav J, Verdonschot Nico
Biomedical NMR, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands.
Department of Radiology, Academic Medical Center, Amsterdam, The Netherlands.
Magn Reson Med. 2017 Jul;78(1):58-68. doi: 10.1002/mrm.26341. Epub 2016 Jul 15.
To introduce a method for obtaining fat-suppressed images in real-time MRI of moving joints at 3 Tesla (T) using a bSSFP sequence with phase detection to enhance visualization of soft tissue structures during motion.
The wrist and knee of nine volunteers were imaged with a real-time bSSFP sequence while performing dynamic tasks. For appropriate choice of sequence timing parameters, water and fat pixels showed an out-of-phase behavior, which was exploited to reconstruct water and fat images. Additionally, a 2-point Dixon sequence was used for dynamic imaging of the joints, and resulting water and fat images were compared with our proposed method.
The joints could be visualized with good water-fat separation and signal-to-noise ratio (SNR), while maintaining a relatively high temporal resolution (5 fps in knee imaging and 10 fps in wrist imaging). The proposed method produced images of moving joints with higher SNR and higher image quality when compared with the Dixon method.
Water-fat separation is feasible in real-time MRI of moving knee and wrist at 3 T. PS-bSSFP offers movies with higher SNR and higher diagnostic quality when compared with Dixon scans. Magn Reson Med 78:58-68, 2017. © 2016 International Society for Magnetic Resonance in Medicine.
介绍一种在3特斯拉（T）的移动关节实时磁共振成像（MRI）中使用具有相位检测的平衡稳态自由进动（bSSFP）序列获取脂肪抑制图像的方法，以增强运动过程中软组织结构的可视化。
对9名志愿者的手腕和膝盖在执行动态任务时用实时bSSFP序列进行成像。为了适当选择序列定时参数，水像素和脂肪像素表现出异相行为，利用这一特性重建水图像和脂肪图像。此外，使用两点Dixon序列对关节进行动态成像，并将所得的水图像和脂肪图像与我们提出的方法进行比较。
关节能够以良好的水脂分离和信噪比（SNR）进行可视化，同时保持相对较高的时间分辨率（膝盖成像为5帧/秒，手腕成像为10帧/秒）。与Dixon方法相比，所提出的方法生成的移动关节图像具有更高的SNR和更高的图像质量。
在3 T下对移动的膝盖和手腕进行实时MRI水脂分离是可行的。与Dixon扫描相比，相位敏感bSSFP提供的图像具有更高的SNR和更高的诊断质量。《磁共振医学》78:58 - 68, 2017。© 2016国际磁共振医学学会。
