Hello -
I'm trying to salvage some odd DTI artifacts occuring in a few subjects data. Its caused the inferior slices to shear off to one side somewhat on both b0 and DW images. In one subject, this affected one repetition of the sequence but not the other, and FNIRT seems to have done a good job realigning the poor repetition on a first pass, without any parameters set.
Can you recommend some parameters to look at that might help tweak this registration?
Also, for two other subjects this artifact affected both repetitions. I am considering taking the skewed b0 image and using FNIRT to align it to a T2 weighted reference acquired in the same session, hoping the intensities will be similar enough. Does this sound reasonable?
Thanks,
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