Abstract #4245
A Golden Angle of 68.75 improves gradient spoiling in radial GRE
Peter Speier 1 and Michael S. Hansen 2
1
Siemens AG Healthcare Sector, Erlangen,
Germany,
2
National
Institutes of Health - NHLBI, MD, United States
Values for the Golden Angle depend on the symmetry of
the problem. For radial imaging with symmetric echoes a
value of 111.25 is typically used, but a value of
68.75, corresponding to the adjacent angle, could be
used as well. For GRE sequences with radial trajectories
instead of Cartesian trajectories, the efficiency of
in-plane gradient spoilers is reduced due to the
non-constant spoiling direction; spoiling efficiency
decreases with increasing projection advance angle. We
conducted phantom measurements to demonstrate that
artifacts from incomplete spoiling can be reduced by
selecting the smaller Golden Angle value for the advance
angle.
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