[caret-users] problems flattening partial hemisphere

[Donna Dierker]

Hi Roland,

Wow -- you're right:  That flat surface *is* funny looking.  My initial 
impression is that it's not applying a cut where the padding meets the 
real surface, the way it used to.  Could you upload your dataset here:

http://pulvinar.wustl.edu/cgi-bin/upload.cgi

It's been ages since I tried to flatten a partial hemisphere, but I'll 
give it a shot.  I'm not aware of a change in procedure, but this 
feature isn't used as much as it used to be, so I could just be out of 
the loop.

Fill the cut-through ventricles, else the surface will have a big 
invagination that will hamper flattening and registration.

Donna

On 11/22/2007 05:10 AM, Roland Marcus Rutschmann wrote:
> Hi,
>
> i think I will (again) try to use caret for individual segmentation. While 
> segmenting a full hemisphere works fine but is a lot of work, I sometimes 
> would like to use occipital flattening only.
>
> I cropped and segmented a right occ-lobe, the surface rendering tells me that 
> there are no topological defects.
>
> When doing Surface->Flatten Partial Hemispheres (with y-ant padding) using the 
> ellipsoid surface I get almost all of my flat surfaces covered red with 
> crossovers. Even after turning of the coloring that part of the surfaces does 
> not have any curvature marks, which I think I need for making the calcarine 
> cut. (see attached image crossover_problem)
>
> Using the Flattening from the fiducual surface, I get no crossovers but a 
> very "funny" form of the flat surface. (flat_from_fidicual.jpg)
>
> The same happens if I crop a bit more posterior. In that case I can use 
> flattening using the ellipsoid but get large gray "rectangular forms" at the 
> edges.
>
> So my questions are:
> a) in earlier versions I got a more or less round flat surface in which I just 
> applied cut through the calcarine as described in Tutorial 3-06 Part II pp 7, 
> and in the manual to caret 5.1.
> Has that procedure changed. Is there some new documentation I missed?
> b) if not, is there any easy way to describe how I should do the partial 
> flattening now.
> c) is it better to fill the cut-through ventricals or leave them as "holes"?
>
> Any tip is very appreciated,
>
> Thanks in advance,
>
> Roland
>
>   
>
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