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Abstract #3681

Motion Detection Improvement of Pencil Beam Navigator Echo with Gradient Reversal Method

Yuji Iwadate 1 , Kunihiro Miyoshi 2 , Masanori Ozaki 2 , and Hiroyuki Kabasawa 1

1 Global MR Applications and Workflow, GE Healthcare Japan, Hino, Tokyo, Japan, 2 MR Engineering, GE Healthcare Japan, Tokyo, Japan

Pencil beam navigator echo suffers from undesired excitation outside the beamfs area when the tracker placement is inappropriate. We developed a signal combination method with gradient reversal to cancel out the effects of the side-lobe with the smallest radius from the beam center. The proposed method diminished the undesired signal contamination in both phantom and volunteer scan, and the resultant navigator-gated 3D-SPGR image had less motion artifacts than the conventional method.

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