[Freesurfer] Mri_segstats on longitudinal data (NVoxels)

Hi all,

My question is twofold

using an user specified ROI in MNI512-space I ask Freesurfer to create tables for both cross-sectionally& longitudinally processed data.

Mri_segstats performed over both cross-sectional data folders and longitudinal data folders

However, when inspecting the data, the NVoxels for all time points in the longitudinal data are equal, while in the cross-sectional they differ (and are generally larger). Is this to be expected?

In addition to NVoxels and mean intensity, our lab would like to use other measures such as thickness, does anyone know the correct function to call for that information?

Right now the pipeline look like this:

Step1 standardised labels from volumes

This step is focused on the ROIs, not the subjects, is submitted as a single job

Uses *mri_vol2vol *and *mri_cor2label*.

Step 2 Create personalised labels, volumes & tables This is the part that is submit to the cluster for each subject (separate for cross-sectional and longitudinal). It uses *mri_label2label*, *mri_label2vol *and *mri_segstats*.

Thanks!

Ferdi van de Kamp