Hi Yoon
Yes, you can also analyze area that way.

Best, Martin

On 08/30/2013 04:47 PM, Chung, Yoonho wrote:
Thanks Martin!. I have another quick question.
I am also interested in looking at developmental changes in the brain during 
adolescence period in normal subjects and also comparing our controls to our 
clinical cohort. Examples in the longitudinal processing stream tutorial have 
only mentioned volume and thickness, so I was wondering if area is also 
something we could include in our analyses. I successfully generated rate of 
change, spc, pc1 etc .mgz files in the post processing stage using 
'long_mris_slopes' using '--meas area', but I just wanted to make sure if rate 
of change in surface area using freesurfer longitudinal stream and also the corresponding significance maps using tksurfer is something we can report in our manuscript. I haven't found any papers reporting changes in the 
surface area using fs long stream so I was wondering if this measure is good to 
go or if it is something that is still work in progress. Thanks for your help!

      
Cheers,
Yoon

      


      

      

        
On Aug 30, 2013, at 4:14 PM, Martin Reuter <mreuter@nmr.mgh.harvard.edu>
          wrote:

        

        
Hi Yoon,

          

          I usually run mri_glmfit directly and then look at the gamma
          map (that is the average if you ran a one sample group mean
          analysis, which is what you did, I think).

          

          qdec is just a wrapper around glmfit so the file should be
          there, I am not sure if qdec can visualize it directly? (am
          not too familiar with that tool). Maybe someone else knows as
          this is the same for any analysis run via qdec (I cc'ed Nick
          who probably knows more).

          

          If qdec cannot do it, you can probably find the gamma.mgh file
          in the glm/constrast subdirectory and then open it with
          tksurfer.

          

          Best, Martin

          

          On 08/30/2013 02:16 PM, Chung, Yoonho wrote:

          
Dear Freesurfers,

            

            Is there a way to visualize average absolute symmetrized
            percent thickness/volume/area change (not significance map)
            using qdec or tksurfer or other freesurfer tools?

            I successfully generated correlation significance map using
            qdec for the longitudinal data we processed, but I am also
            interested in looking at just simple average across all
            subjects. Thanks so much!

            

            Cheers,

            Yoon

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          Martin Reuter, Ph.D.

          Assistant in Neuroscience - Massachusetts General Hospital

          Instructor in Neurology   - Harvard Medical School

          MGH / HMS / MIT

          

          A.A.Martinos Center for Biomedical Imaging

          149 Thirteenth Street, Suite 2301

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-- 
Martin Reuter, Ph.D.
Assistant in Neuroscience - Massachusetts General Hospital
Instructor in Neurology   - Harvard Medical School
MGH / HMS / MIT

A.A.Martinos Center for Biomedical Imaging
149 Thirteenth Street, Suite 2301
Charlestown, MA 02129

Phone: +1-617-724-5652
Email: 
   mreuter@nmr.mgh.harvard.edu
   reuter@mit.edu
Web  : http://reuter.mit.edu