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Abstract #1855

Comparison of respiratory navigator-gating techniques in two-dimensional spoiled gradient-recalled echo sequence

Hirofumi Hata1, Yusuke Inoue2, Ai Nakajima1, Shotaro Komi1, Yutaka Abe1, Keiji Matsunaga2, and Hiroki Miyatake1

1Department of Radiology, Kitasato University Hospital, Sagamihara, Japan, 2Department of Diagnositic Radiology, Kitasato University School of Medicine, Sagamihara, Japan

We compared navigator-gating techniques for free-breathing 2D SPGR images of the liver using pencil-beam excitation and self-navigation techniques in 3 T MRI. In pencil-beam navigator, single-check (PB-SC) and double-check (PB-DC) modes were examined. In self-navigator scans, self-navigator signals were acquired in two fashions; before (SN-Pre) or after (SN-Post) the imaging read-out. Visual analysis shows that respiratory waveforms fluctuated in SN-Post. Quantitative and qualitative image evaluations show that PB-DC and SN-Post had better image qualities than the others. Considering scan time was about doubled in SN-Post, PB-DC should be the best for respiratory navigation in 2D SPGR imaging at this stage.

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