Two-Dimensional Spoiled Gradient-Recalled Echo Magnetic Resonance Imaging of the Liver Using Respiratory Navigator-Gating Techniques. Issue 5 (September 2017)

• Record Type: Journal Article
• Authors: Inoue, Yusuke; Hata, Hirofumi; Matsunaga, Keiji; Nakajima, Ai; Komi, Shotaro; Abe, Yutaka; Miyatake, Hiroki
• Is Part Of: Journal of computer assisted tomography. Volume 41:Issue 5(2017)
• Publication Date: 2017-09
• Subjects: magnetic resonance imaging -- respiratory motion -- navigator -- 2D SPGR -- liver; Tomography -- Periodicals; Tomography -- Periodicals; Tomography; Periodicals; 616.0757
• DOI: 10.1097/RCT.0000000000000605
• Languages: English
• ISSNs: 0363-8715

Abstract

Abstract : Objective: 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. Methods: 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. Results: 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. Conclusions: 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.