Dear Gabor,
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> 1. Do I need to acquire twice the full DTI for TOPUP, or it is enough to measure a full DTI with the "first" phase encoding direction and only a B0 image with the "second" phase encoding direction?
Yes, it is enough to acquire only the b0 with the 2nd phase encoding.
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> 2. Can I also use FUGUE for distortion correction of my DTI scans, or FUGUE works only for gradient-echo EPI?
Yes, fugue works also for SE-EPI.
Good luck Jesper
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> Thanks a lot,
> Gabor
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