Dear all,
1, I ran Bet on my "fieldmap magnitude" image and erdoded the results (FMAP_MAG_brain_ero).
2, I used this brain extracted and eroded magnitude (FMAP_MAG_brain_ero) when processing my "fieldmap phase" using fsl_prepare_fieldmap to exclude noisy non-brain or partial volume voxels.
My question: Which version of the brain extracted magnitude image should be used as "Fieldmap mag" in FEAT/Pre-stats/B0 unwarping? The eroded version (FMAP_MAG_brain_ero) or the other one (FMAP_MAG_brain)?
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