Will field shifts due to head rotation compromise motion correction?

We have characterised the size and locations of the maximum B0 field shifts within the brain at 7T for head pitch and roll angles in order to determine how these may be accounted for in motion correction. B0 difference maps of the brain were acquired from 5 healthy volunteers, each being imaged at 4 different head orientations. Eight small VOIs located at the positions of the largest observed field changes were analysed for each subject. The B0 field difference maps are spatially similar across all subjects and the magnitude of shift shows a linear dependence on the angle of both pitch and roll. The maximum frequency shift occurs in the frontal lobe during pitch where the sensitivity is -1.320.02 Hz/degree.

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