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Abstract #3351

Effective Flip Angle of Enhanced Navigator-Gated 3D Spoiled Gradient-Recalled Echo Sequence

Yuji Iwadate1, Atsushi Nozaki1, Keisuke Sato2, Kengo Yoshimitsu2, Ryotaro Jingu3, Ryuji Nakamuta3, and Hiroyuki Kabasawa1
1Global MR Applications and Workflow, GE Healthcare Japan, Hino, Japan, 2Department of Radiology, Fukuoka university, Fukuoka, Japan, 3Radiology Center, Fukuoka University Hospital, Fukuoka, Japan

An enhanced navigator-gated 3D-SPGR (eNAV-3D-SPGR) enables free-breathing T1-weighted abdominal MRI with navigator echo signal enhancement. In this study, we calculated effective flip angle of eNav-3D-SPGR in simulation and examined its validity for obtaining desired contrast. Simulation shows that the effective flip angle of 30° was achieved with eNav-3D-SPGR when the flip angle was set to 36.8°. Actual scan resulted in the similar signal ratios between the conventional method with flip angle 30° and eNav-3D-SPGR at flip angle of 37°. eNav-3D-SPGR with the desired effective flip angle can be useful for accurate motion detection when the liver MRI signal is low.

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