Hi all, I would be very grateful of any advice for the problem below with e-TIV.
I have another problem with the longitudinal streaming (it is the first time I use it). I am running the .base and .long procedure in subjects with only one measure to include them in a mixed liner model analysis (as suggested in the wiki). I run the following commands:
recon-all -base template100 -tp subj025 -all
recon-all -long subj025 template100 -all
However at the second command line an error occur (attached is the log):
BEGIN failed--compilation aborted at /Applications/freesurfer/mni/bin/nu_correct line 37. ERROR: nu_correct Darwin iMac-di-Angela.local 11.4.2 Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64 x86_64
recon-all -s subj025.long.template100 exited with ERRORS
Which is my mistake? I looked for a solution in the mailing list, but I did not find an answer. Thank you for any help!
Angela
Dear Freesurfer experts, I have a question about eTIV (FS 5.3) which I use as a covariate where appropriate. Is it in some way influenced by the presence of brain atrophy? I have a new sample of subjects in a longitudinal study: at time 1 they have some atrophy (due to low body weight) that improves in time 2 (4 months). I observed that eTIV-time1 is slightly correlated with weight (r=0.3) whereas no correlation is present at time 2. The correlation between eTIV-time1 and eTIV-time2 is somewhat lower than expected (r=0.53) and is lower than correlation between SegBrain_Vol_1 and SegBrain_Vol_2 (0.65).
Do you suggest in these cases to perform manual segmentation to obtain TIV? or is there any other method (in freesurfer) to obtain an estimate of TIV not influenced by brain atrophy? What about using BrainMask_to_TIV?
Thank you for any suggestion
Angela
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