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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