There is no button in SPM to do this.
CSF segmentation in SPM5 may not be so accurate (it depends on the data). If
you feel that it is accurate enough, then all you need to do is obtain the
total GM volumes, the total WM volumes and the total CSF volumes - and add
them up. There are a few mails on the list about how to do this, but this
one may be the most useful.
https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind0701&L=SPM&P=R10670
I am trying to make the CSF segmentation a bit more accurate, and one of the
tools in SPM8b may do a better job of this segmentation (as well as alleviate
some of the issues relating to poor initial affine registrations).
Best regards,
-John
On Monday 15 December 2008 22:35, Suzanne> <Hilleary wrote:
> Hello, community.
>
> The question of how to get total intracranial volume has been asked
> numerous times in different variations, but the answer still seems to be a
> little unclear...
>
> 1. Is it appropriate to get an estimate of TIV by summing GM, WM, and CSF
> volumes?
> 2. If so, what is the procedure within SPM5 for going about doing this
> (calcuating GM, WM, and CSF volumes)?
>
> Any help would be appreciated, as I am very new to this program.
>
> Best,
>
> Suzanne
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