Inoue Yusuke, Hata Hirofumi, Matsunaga Keiji, Nakajima Ai, Komi Shotaro, Abe Yutaka, Miyatake Hiroki
From the *Department of Diagnostic Radiology, Kitasato University School of Medicine; and †Department of Radiology, Kitasato University Hospital, Sagamihara, Japan.
J Comput Assist Tomogr. 2017 Sep/Oct;41(5):688-695. doi: 10.1097/RCT.0000000000000605.
We assessed the feasibility of T1-weighted 2-dimensional spoiled gradient-recalled (2D SPGR) acquisition in steady-state imaging of the liver with various respiratory navigator gating techniques.
A total of 12 healthy volunteers underwent in-phase and out-of-phase 2D SPGR imaging of the liver during breath-holding and free-breathing. Four techniques for respiratory navigation, 2 conventional navigator techniques and 2 self-navigator techniques, were used for free-breathing imaging.
Good navigator waveforms were obtained in conventional navigation, whereas fluctuations were evident in self navigation. All of the 4 navigator-based methods provided better images in terms of background signals and visual image quality compared with images obtained with no respiratory control. However, differences remained in comparison with breath-holding. Superiority of self-navigation to conventional navigation was not shown.
Navigator-gating techniques improved 2D SPGR images of the liver acquired during free-breathing, suggesting feasibility and beneficial effects, although navigator-based images were still inferior to breath-hold images.
我们评估了采用各种呼吸导航门控技术在肝脏稳态成像中进行T1加权二维扰相梯度回波（2D SPGR）采集的可行性。
共有12名健康志愿者在屏气和自由呼吸期间接受了肝脏的同相位和反相位2D SPGR成像。四种呼吸导航技术，即2种传统导航技术和2种自导航技术，用于自由呼吸成像。
在传统导航中获得了良好的导航波形，而在自导航中波动明显。与无呼吸控制获得的图像相比，所有4种基于导航的方法在背景信号和视觉图像质量方面都提供了更好的图像。然而，与屏气相比仍存在差异。未显示出自导航优于传统导航。
导航门控技术改善了自由呼吸期间采集的肝脏2D SPGR图像，表明其可行性和有益效果，尽管基于导航的图像仍不如屏气图像。
