Hi Bastian,
actually (see other mail today) it computes percent thickening per year
as it is the slope of the linear fit into the measurements (thickness
with respect to age or time). If the slope is negative, there is thinning.
The results (within subject and on fsaverage) have signs so they
By the way, smoothing can remove the thickening (if there is only a
little and mainly thinning ).
Best, Martin
On 08/05/2013 02:18 PM, Martin Reuter wrote:
Hi Bastian,
actually (see other mail today) it computes percent thickening per year
as it is the slope of the linear fit into the
Dear freesurfer-experts,
I have successfully done a longitudinal analysis on cortical thickness
changes over 2 timepoints (0 and 1 year).
My question is:
If I look at the -individual- overlays of perc. change (i.e. pc1fit),
only positive values are shown.
whereas at the -fsaverage- view,
