Teddy,

As you discovered, qdec does not yet support volumetric analysis.  A
feature in the works is to allow analysis of the volumetric data that
freesurfer produces, such as comparing, say, age to hippocampal volume.
That data would be displayed in bar-graph form.  

Its not likely that qdec will support voxel analysis in the way SPM
performs volumetric analysis, as the intent of qdec is process data
produced by freesurfer, but the idea is not ruled out, as the core
utilities (stats and graphics) exist to create such a thing.  It may be
possible to do this now manually with mri_glmfit, but I haven't done it
myself.

Nick


On Sun, 2008-05-04 at 16:24 -0500, Teddy Youn wrote:
  

Hi again,


I had another question for the listserv about the uses of qdec.  After finishing a set of subjects (12 controls and 6 subjects), our group wanted to see if we could use qdec to report the number of voxels that are different (e.g. measuring volume, thickness, etc.) between one group to another.  We have searched the tutorial and the faqs and haven't come upon any information on this.

Any help you can provide would be great.

Thanks in advance,


-Teddy Si Youn

Doris Duke Clinical Research Fellow '07-'08 
North Texas TBI Research Center
UT Southwestern Medical Center at Dallas 
Warren Alpert School of Medicine at Brown University, MD '09
Teddy.Youn@utsouthwestern.edu 
(401)-714-2847 

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MGH-NMR Center
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