When you run your original analysis, you probably smoothed the map
before doing the group analysis. This smoothing would not be in your ROI
analysis, and the difference could be pretty big if the label is small.
Also, the area map will have a jacobian correction that will not be in
the raw data.
On 10/19/2020 11:29 PM, 李梦君 wrote:
External Email - Use Caution
Dear FreeSurfer Developers:
I compared the thickness, area, volume in the mild traumatic brain
injury patients with health control by FreeSurFer, and found
a statistic difference region in the cortex area, I defined
the statistic difference region as a label on the fsaverage and mapped
this label to subjects by Qdec/mri_label2label. The label defined on
the fsaverage was mapped onto all subjects successfully, and the label
in subjects matched well with the inflated cortex of subjects
in Freeview Then the area value of the label in every single subjects
was extracted, and I found that there is no statistic difference in
the area value between the mild traumatic brain injury patients and
health control. I have checked the segmentation of every subjects and
it was a good job done by FreeSurFer.
FreeSurfer version: freesurfer-Darwin-OSX-stable-pub-v6.0.0-2beb96c
Platform: macOS High Sierra.
Best wishes
Mengjun Li
Second Xiangya Hospital
Central South University
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