Hi Doug,

Thanks for replying. But our datasets do showed that 
Sum(all structures (after ICV in the list) except ventricle, CSF, cerebellum and brainstem) is much smaller SubCortGrayVol. The former is only about 30-40% of the later. We are using FS 5.1.0 without the SupraTentorialVol fix.I sent you an aseg file some time ago (the last three columns in the sheet). Can you kindly get back to us so that we can know which volume to use for the total cerebral volume analysis.

Thanks,
Zheng Hui

On 10/24/2012 09:01 AM, Zheng Hui wrote:
>
> Hi freesurfer,
>
> We are trying to calculate the total cerebral volume which excludes cerebellum, brainstem, ventricle and CSF from the aseg.txt. Do we use
>
> CortexVol + CorticalWhiteMatterVol + SubCortGrayVol
> Or
> CortexVol + CorticalWhiteMatterVol + Sum(all structures (after ICV in the list) except ventricle, CSF, cerebellum and brainstem)
This should give very close to the same value. I don't think it makes a
difference.
>
>
> Also, I saw Doug's post about the bug fixing for SupraTentorialVol. To re-run the segstats for longitudinal subjects, any extra step other than "recon-all ˇ©long tpN baseID ˇ©segstats" and does it affect any other structure or just SupraTentorialVol?
It should not affect other structures.
doug