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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