the txt-files are saved if you have used the VBM5 toolbox. The values are
the volumes in ml of the raw images and mainly thought to be used in order
to define nuisance parameters for modulated images. You can also apply some
statistical tests to analyze the raw volumes of GM/WM/CSF. I would recommend
to use the "calculate raw volumes" option in the VBM5.1 toolbox to merge the
values of all subjects to one file which can be easily read with
excel/gnumerics (with tabs as delimiters) or any other software.
Christian Gaser, Ph.D.
Assistant Professor of Computational Neuroscience
Department of Psychiatry
Friedrich-Schiller-University of Jena
Philosophenweg 3, D-07743 Jena, Germany
Tel: ++49-3641-935805 Fax: ++49-3641-935280
e-mail: [log in to unmask]
On Fri, 7 Sep 2007 15:51:49 +0100, John McLean <[log in to unmask]>
>I have done some VBM analysis (normalised with modulation) and for each
>subjects output there is a
>Within this file there are three numbers. I am assuming these are the GM,
>WM and CSF volumes and that the units of these numbers are cm^3?
>If i wanted to assess whether there was a global change in GM, WM or CSF
>between repeat scans on a subject group, would it be valid to use these
>figures in a two sample t-test?