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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