A Golden Angle of 68.75 improves gradient spoiling in radial GRE

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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