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Dear all, I had to reorient the data.nii of one brain using avwswapdim z -x y. Now comes the bvecs reorientation. I read bvec emails in archives, but did not find answers to all my questions. I attach a part of Excel file with imported data from my bvecs (1x b=0, 12 directions b=1000). You can see how the ´bad´ bvecs looked like and how I plan to change them - Am I correct? OR: can I first normalize them and then rotate? Also, I show two example bvecs contents of the correctly oriented data - they look still quite different from the ´corrected´ bvecs. Will it still be fine? As you see, I did not normalize them yet, but still could run DTIFit. Is it ´normal´? Is it also ok that the values are not the same in all files? On the bottom (yellow) of the file you will find the first try to normalize bvecs: I get the values 1, 0, -1 only after rounding it up to 0 decimal places (orange). Is such outcome the right one? And: thank you for all advices: I do not always respond directly, not to overload the mailing list with too many ´Thank you`s. But I am really grateful. Best, Aga