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hi, >Should it also be in A>>P? the phase encoding of the GE fieldmaps should not matter, i.e. it can be different from the EPI, even though i tend use the same settings for the two - except that i tend to acquire a few more slices on the fieldmap. hth, andreas ________________________________________ Von: FSL - FMRIB's Software Library [[log in to unmask]] im Auftrag von Martin Kavec [[log in to unmask]] Gesendet: Donnerstag, 16. Juni 2011 23:20 An: [log in to unmask] Betreff: [FSL] Field map for fMRI and DTI on Siemens Hi all, Before I start re-inventing a wheel: I see there is a field mapping sequence on Siemens Verio VB17. Anybody has experience in using it for unwarping fMRI and DTI (e.g. in the presurgical protocol)? Interestingly, the default fMRI sequences have A>>P phase encoding direction, but the field mapping sequence is encoded in R>>L direction. Should it also be in A>>P? How do I know the field map unwarp is being applied on the fMRI and DTI series? Thanks for sharing your experiences. Cheers, Martin