Hi Yawu,

and both baseline and follow-up surfaces (from the *.long.* directories)
are in vertex correspondence, so you can use the ROI on each time point
directly.

Best, Martin

On 05/12/2016 02:00 PM, Douglas N Greve wrote:
> If you used mri_glmfit, then you can use mri_glmfit-sim to create
> significant clusters. It will create an annotation of the significant
> clusters, and you can pass that to mri_segstats along with the stack of
> thickness images to extract the mean thickness in each cluster.
>
> On 05/12/2016 04:23 AM, Liu Y wrote:
>> Hi Freesurfers,
>>
>> I am using the degree of cortical atrophy between two groups. The
>> atrophy rate had no significant difference between two groups, but the
>> average thickness of the baseline and followup showed significant
>> clusters in two regions between the two groups. My question is how to
>> create the ROIs covering the clusters, and then extract the
>> thicknesses on baseline and followup MRIs?
>>
>> Thanks,
>> Yawu
>>
>>
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