A hexagonal spoiler gradient scheme improves the transition to steady state in spoiled gradient echo sequences

When acquired spoiled gradient echo images at flip angles significantly larger than the Ernst angel, the transition to the steady state may not be smooth as predicted by the theoretical signal equations but can oscillate causing artefacts in images. A novel six point spoiling scheme is proposed that minimizes the number of unwanted echoes refocused and ensure that refocused echoes are return to the center of k-space which intern enables the use of RF-spoiling to further remove their effect. This technique is found to improve the approach to steady state compared to using a constant gradient with RF spoiling.

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