[caret-users] flat surface deformation and metric file: how do i create metric file with nodes from flat surface only?

[Donna Dierker]

Hi Quintino,

Post to caret-users at brainvis.wustl.edu rather than 
caret-users-owner at brainvis.wustl.edu; the latter address is just aliased 
to me, so if I'm out of the office, no one else will see your message.  
Posting to caret-users gets many more brains on your question.

As far as I know, there is no way for Caret to output a metric file that 
includes only a subset of nodes.  (It is possible this functionality is 
supported in the GIFTI standard, and that Caret supports it; if so, John 
Harwell will clarify.)

The best you can do is zero out (or set to a number that is more 
obviously not sane, like -99999) the nodes outside the flat surface.  If 
you are visualizing your results on the flat surface, then the 
disconnected nodes won't be visible.  Likewise, you can assign the same 
CUT topology file to your fiducial and/or inflated 3D surfaces, so that 
those nodes are not visible.

Finally, if you are using a third party software package like matlab to 
manipulate your metric files, you could also use a paint file to 
identify nodes inside the surface or outside the surface.  Paint files 
are like metric files, except the nodal information is 
discrete/categorical/ROI vs continuous/scalar/functional.

Donna

On 11/06/2008 09:44 AM, Quintino Mano wrote:
> Hi all,
>
> I'm in the process of deforming a flat surface, which is a selected 
> patch from the left occiptio-temporal cortex. In doing so, the 
> corresponding metric file is also deformed, which is great, but 
> unfortunately the resultant metric file includes nodes from the entire 
> hemisphere, and not just the nodes in my flat surface. Does anyone 
> know how to deform a metric file that is comprised of only nodes that 
> are contained in flat surface?
>
> Many thanks in advance!
>
> Quintino
>