[caret-users] problems flattening partial hemisphere

[Roland Marcus Rutschmann]

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

-- 
Dr. Roland Marcus Rutschmann <Roland.Rutschmann at psychologie.uni-regensburg.de>
Institute for Experimental Psychology, University of Regensburg
Universitätsstraße 31, 93053 Regensburg, Germany
Tel: +49 941 943 2533, Fax: +49 941 943 3233
http://www.psychologie.uni-regensburg.de/Rutschmann
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