With increasing use of ultra-high field, there is a need for fast and efficient field mapping. Towards this purpose, the non-Cartesian circular rosette trajectory is advantageous due to its low gradient demands and its efficiency due to the simultaneous acquisition of spatial and field encoding information. We describe the implementation of the circular rosette trajectory for field mapping at 7T in the human brain and compare this to the highly accurate although slow 5 echo Bolero field map.
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