Yes, you can. The only thing that TRACULA uses from the structural is the
aparc+aseg, and specifically the relative positions (left, right, anterior,
etc.) of each tract with respect to the segmentation labels in the aparc+aseg.
It's safe to assume that those positions will not have changed between
sessions. If the sessions are not too far apart, the registration between the
diffusion and structural within-subject across sessions will probably be OK,
but that's something to check.
________________________________
From: freesurfer-boun...@nmr.mgh.harvard.edu
<freesurfer-boun...@nmr.mgh.harvard.edu> on behalf of Alexopoulos, Dimitrios
<dimitriosalexopou...@wustl.edu>
Sent: Wednesday, May 2, 2018 3:02:16 PM
To: Freesurfer support list
Subject: [Freesurfer] using diffusion for tracula, but with surfaces from a
different MR sessions
External Email - Use Caution
We have acquired data on a few kids and have generated nice surfaces, however,
the diffusion data we acquired (102 directions and AP/PA distortion maps) were
suspect due to motion and results from Tracula were not ideal.
We have since brought these kids back for a repeat scan, but only acquired the
diffusion sequences, and no structural T1.
Can we use the original surfaces/output as input to tracula with the DTI data
from the repeat MR session?
Jim
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