It is neither:) See http://surfer.nmr.mgh.harvard.edu/fswiki/eTIV and/or
Buckner et al. (2004) NeuroImage
<https://surfer.nmr.mgh.harvard.edu/fswiki/NeuroImage> 23:724-738.
"Basically, total intracranial volume is found to correlate with the
determinant of the transform matrix used to align an image with an
atlas. The work demonstrates that a one-parameter scaling factor
provides a reasonable TIV estimation. This method uses an atlas based
spatial normalization procedure, and requires that the *talairach.xfm*
is correct. "
This performs the talairach registration for a subject. Then, based only
on the numbers in the matrix, it estimates the ICV based on subjects
that had similar matrices.
doug
On 5/7/13 9:42 PM, Alejandra Infante wrote:
Hi,
I understand that ICV is an estimated measure based on a standard
talairach transformation; however, I want to know how freesurfer is
defining intracranial volume (i.e., is this a representation of
everything within the cranium as the name implies or is it an estimate
of total brain volume, which would not include space between skull and
dura)?. We are using fs vesion 5.1
--
M. Alejandra Infante
Doctoral Student
SDSU/UCSD Joint Doctoral Program in Clinical Psychology
Phone: (858) 449-2950
E-Mail: infante.alejandr...@gmail.com
<mailto:infante.alejandr...@gmail.com>
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