Is the corpus callosum segmentation based on the Hofer and Frahm functional
parcellation, a mathematical formula, or, as listed on the website, 5 equal
subdivision roughly along the long axis? What is the preferred citation for
this?
Thanks.
___
Freesurf
liano
From: alessia_giuli...@hotmail.it
To: freesurfer@nmr.mgh.harvard.edu
Date: Fri, 6 Jun 2014 06:46:29 +
Subject: Re: [Freesurfer] Corpus Callosum segmentation reliability
Dear Bruce,
the two subject dirs are here
https://www.dropbox.com/sh/k1z5o0e6sq90qq0/AABx38QxKvxDhUe2lV9imaa9a.
The ori
Dear Bruce,
did you see the images that I have sent you?
Thanks,
Alessia Giuliano
From: alessia_giuli...@hotmail.it
To: freesurfer@nmr.mgh.harvard.edu
Date: Fri, 6 Jun 2014 06:46:29 +
Subject: Re: [Freesurfer] Corpus Callosum segmentation reliability
Dear Bruce,
the two subject dirs are
: freesurfer@nmr.mgh.harvard.edu
Subject: Re: [Freesurfer] Corpus Callosum segmentation reliability
hmmm, that is puzzling. Can you upload the two subject dirs with the
rotated direction cosines and I'll take a look?
thanks
Bruce
On Thu, 5 Jun 2014, Alessia
Giuliano wrote:
> Dear Bruce,
lessia Giuliano
Date: Thu, 5 Jun 2014 08:30:10 -0400
From: fis...@nmr.mgh.harvard.edu
To: freesurfer@nmr.mgh.harvard.edu
Subject: Re: [Freesurfer] Corpus Callosum segmentation reliability
Hi Alessia
when you say "the image was rotated" do you mean you actually transformed
the image,
to improve the CC segmentation in order to consider
the volumes of its subregions to be reliable?
Thank you,
Alessia Giuliano
Date: Thu, 5 Jun 2014 08:30:10 -0400
From: fis...@nmr.mgh.harvard.edu
To: freesurfer@nmr.mgh.harvard.edu
Subject: Re: [Freesurfer] Corpus Callosum segmentation reliability
H
Hi Alessia
when you say "the image was rotated" do you mean you actually transformed
the image, or you simply changed the image header to reflect a new
orientation? I wouldn't think the latter would have a big effect, but the
former will involve an additional image interpolation (blurring) a
th
respect to CC eigen axes, but independently from the initial orientation of
the scan.
Thank you,
Alessia Giuliano
Date: Mon, 26 May 2014 12:02:26 -0400
From: fis...@nmr.mgh.harvard.edu
To: freesurfer@nmr.mgh.harvard.edu
Subject: Re: [Freesurfer] Corpus Callosum segmentation
Hi Alessia
i
respect to CC eigen axes, but independently from the initial
orientation of the scan.
Thank you,
Alessia Giuliano
Date: Mon, 26 May 2014 12:02:26 -0400
From: fis...@nmr.mgh.harvard.edu
To: freesurfer@nmr.mgh.harvard.edu
Subject: Re: [Freesurfer] Corpus Callosum segmentation
Hi Alessia
it's t
Hi Alessia
it's tought to tell from a single slice as the subject's head orientation
might be a bit slanted. The subregions in the CC are defined purely by the
distance along the CC's eigenaxis.
cheers
Bruce
On Mon, 26 May
2014, Alessia Giuliano wrote:
Dear FreeSurfer team,
I'm intreste
Hi Carolina,
I think we gave some details about the method here:
H.D. Rosas, S.Y. Leea, A.C. Bendera, A.K. Zaletaa, M. Vangelc, P. Yu, et
al, Altered white matter microstructure in the corpus callosum in
Huntington's disease: Implications for cortical "disconnection",
Neuroimage, 49(4):2995-30
Hi,How is the segmentation of the corpus callosum is done? What are the proportions used? Are they equal in longitudinal lenth or it follows some a special segmentation?Do you know how to access the map (color map / visualization) of this segments?Thank you, Carolina
___
yes.
On Wed, 29 Apr 2009, Wayne Su wrote:
Thank you Bruce,
So, if I want to report the volume of the Corpus Callosum, I should add up
the volumes of CC_Posterior, CC_Mid_Posterior, CC_Central, CC_Mid_Anterior,
CC_Anterior only. The ctx-?h-corpuscalosum/wm-?h-corpuscallosum is just
useless and b
Thank you Bruce,
So, if I want to report the volume of the Corpus Callosum, I should add up
the volumes of CC_Posterior, CC_Mid_Posterior, CC_Central, CC_Mid_Anterior,
CC_Anterior only. The ctx-?h-corpuscalosum/wm-?h-corpuscallosum is just
useless and better to remove them from wmparc.mgz since th
you're probably right. We used to segement the cc on the surface, but
this wasn't nearly as accurate as in the volume, which replaced it.
cheers
Bruce
On Wed,
29 Apr 2009, Wayne Su wrote:
The Freesurfer 4.3 segments the cc into 5 parts. But the wmparc.mgz has both
5 parts along with ctx-?h-c
The Freesurfer 4.3 segments the cc into 5 parts. But the wmparc.mgz has both
5 parts along with ctx-?h-corpuscallosum/ wm-?h-corpuscallosum. I think they
should not co-exist. Maybe I¹m wrong.
Wayne
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