Thanks, but I not understand if the follow step that you suggested me should be used also for FS-FAST analysis. Specifically, I'm refferring to: 1Sample each individual's surface onto the average surface. 2Compute the difference between each of the pairs in the average surface space. 3Concatenate the differences into one file. 4Smooth on the surface (optional)5Perform analysis with mri_glmfit on this file Importantly, should I create the two fsgd files as reported in the web page and below? Or only the second is due? One is:GroupDescriptorFile 1Class MainInput subject1 MainInput subject1match MainInput subject2 MainInput subject2match MainInput subject3 MainInput subject3match MainInput subject3 MainInput subject3match Main the other is:GroupDescriptorFile 1Class MainVariables AgeInput subject1pair Main 30Input subject2pair Main 40Input subject3pair Main 50Input subject4pair Main 60 Thanks Regards
Stefano
----Messaggio originale----
Da: "Douglas Greve" greve@nmr.mgh.harvard.edu
Data: 18-set-2017 0.13
A: freesurfer@nmr.mgh.harvard.edu
Ogg: Re: [Freesurfer] FS-FAST longitudinal analyis
That looks correct. You can also checkout the instructions here:
https://surfer.nmr.mgh.harvard.edu/fswiki/PairedAnalysis
On 9/17/17 6:07 PM, stdp82@virgilio.it wrote:
Hi list,
I'm not sure that the files reported below are correct to assess the longitudinal difference between T1 and T2. Please, could you check it? The result which I have obtained bu running mri_glmfit is too strange. Thanks Best regards Stefano
1) PAIRWISE.fsgd file ------------------- GroupDescriptorFile 1 Class subj1 Class subj2 ... Class subjN Variables TP1-vs-TP2 Input subj1_tp1 subj1 1 Input subj1_tp2 subj1 -1 Input subj2_tp1 subj2 1 Input subj2_tp2 subj2 -1 ... Input subjN_tp1 subjN 1 Input subjN_tp2 subjN -1 ----------------------------
2) mean.mtx 1 1 ... 1 0 ------------------------------ 3) tp-effect.mtx 0 0 ... 0 1 ------------------------------ 4) mri_glmfit --glmdir PAIRWISE --y ces.nii.gz --wls cesvar.nii.gz --surface fsaverage rh --nii.gz --fsgd PAIRWISE.fsgd doss --C mean.mtx --C tp-effect.mtx
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