read_curv.m should do the trick
On Wed, 19 Jun 2013, Jürgen Hänggi wrote:
Dear Bruce
Yes, the .max and the .min files were produced, but how to access the values
in it. Is there a possibility to import these files into MATLAB?
Thanks in advance
Cheers
Jürgen
On [DATE], "Bruce Fischl" <[ADDRESS]> wrote:
.H is mean and .K is Gaussian curvature. It should also write a .max and
.min, doesn't it? Those are the principal curvatures that you want.
Bruce
On Tue, 18 Jun 2013, Jürgen Hänggi
wrote:
Dear Bruce
Thanks a lot for the info. It worked fine, but how can I open the resulting
.H and .K files?
Cheers
Jürgen
On [DATE], "Bruce Fischl" <[ADDRESS]> wrote:
Hi Jürgen
you could quantify this if you want. Use mris_curvature to compute the
mean curvature maps independently (the first and second principal
curvatures). These have the units of 1/mm and are exactly the radius of
curvature. You could histogram them and look at the distribution.
cheers
Bruce
p.s. I think you want -w -max and -w -min flags for it
On Fri, 14 Jun 2013, Jürgen Hänggi
wrote:
Dear FS experts
In one of our paper, I tried to explain how FS is able to produce cortical
thickness maps in a spatial resolution that go beyond the resolution of the
original MRI acquisition.
We wrote the following:
The thickness maps produced are not limited to the voxel resolution of the
image and thus sensitive for sub-millimeter differences between groups
(Fischl, Dale 2000). The way in which the resolution of the cortical
thickness maps goes beyond the resolution of the original acquisition can
be
imagined as a (conventional) partial volume correction procedure. The
cortex
is smooth at the spatial scale of a couple of millimeters, which is imposed
as constraint by FreeSurfer to estimate the location of the surface with
subvoxel accuracy. For instance, if a given voxel is darker than its
neighbouring grey matter it probably contains more CSF and so the surface
model is at a slightly different position than if the neighbouring voxels
were brighter and therefore contain probably more white matter.
Now, the reviewer says that we are to vague in our description. He would
like to know what is exactly meant by a "couple of millimeters".
Is this 1-3 mm or rather 3-5 mm or any other value?
Thanks in advance for any suggestion
Regards
Jürgen Hänggi
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Jürgen Hänggi, Ph.D.
Division Neuropsychology
Institute of Psychology
University of Zurich
Binzmuehlestrasse 14, PO Box 25
8050 Zurich, Switzerland
0041 44 635 73 97 (phone office)
0041 76 445 86 84 (phone mobile)
0041 44 635 74 09 (fax office)
BIN 4.D.04 (office room number)
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Jürgen Hänggi, Ph.D.
Division Neuropsychology
Institute of Psychology
University of Zurich
Binzmuehlestrasse 14, PO Box 25
8050 Zurich, Switzerland
0041 44 635 73 97 (phone office)
0041 76 445 86 84 (phone mobile)
0041 44 635 74 09 (fax office)
BIN 4.D.04 (office room number)
j.haenggi[at]psychologie.uzh.ch (email)
http://www.psychologie.uzh.ch/neuropsy/ (website)
http://www.juergenhaenggi.ch (private website)
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