OK, I just verified it is a left-right flip.
I created an ROI in fslview, saved it and then did:
fslmaths test -x y z testflip
When I loaded in testflip.nii.gz, it was positioned where test.nii.gz was.
But when I remove test.nii and reload it, it is now on the other hemisphere
(and mirrors the original file). There is no y or z shift.
What implications does using the testflip.nii.gz ROI have for the resulting
tractography?
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