[Mristudio-users] problem with re-oriented fiber tracts

[Paul Beach]

Hi everyone,

I'm in the process of reorienting subjects to a more standard space using 7
landmarks across subjects.  For the most part the transformation matrix
saved post rigid/affine transformation is reorienting fiber tracts perfectly
(we're confirming this using FSL).  However some subject's fiber tracts are
going way off when we apply their respective transformation matrices.
They'll be slanted in the axial view, etc.  Something I've noticed is that
the subjects whose tracts are mis-rotated are loading into landmarker upside
down and require me to remove a (-) sign from their raw image information.
However, not all subjects that load upside down are resulting in fiber
tracts that are mis-oriented.

Any suggestions as to why this might be occurring?

Thanks,

Paul
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