Hi Sujith, look at this page and see if it answers your questions
http://surfer.nmr.mgh.harvard.edu/fswiki/CoordinateSystems
doug
On 08/19/2013 01:23 PM, sujith vijayan wrote:
> I am looking at intracranial electrode recordings from some epileptic
> patients. The locations of the electrodes hav
I am looking at intracranial electrode recordings from some epileptic
patients. The locations of the electrodes have been determined using a
preoperative MRI and a postoperative CT scan. The locations are in RAS
coordinates. Is there some sort of function that will allow me to translate
the RAS coo
The auto is what is automatically created. The other will be the same
as the auto unless you have made manual adjustments.
doug
On Wed, 23 Jun 2010, Corey Keller wrote:
> Hi freesurfers,
>
> I am trying to convert electrode coordinates from RAS to talairach
> space. I have 128 electrodes sittin
Hi freesurfers,
I am trying to convert electrode coordinates from RAS to talairach
space. I have 128 electrodes sitting directly on the pial surface
which was created from recon-all. I see that the output of each
reconstruction has two transforms, talairach.xfm and
talairach.auto.xfm. There seems
Hi,
please find attached some matlab functions this transformation. All of my
freesurfer_*.m files are available by anonymous cvs checkout, see
http://eeg.sf.net for details.
Kind regards, Darren
Doug Greve wrote:
If you've done the freesurfer recon, then you should have one in
yoursubject/mri/
If you've done the freesurfer recon, then you should have one in
yoursubject/mri/transforms.
The matlab file just converts MNI talairach coordinates to "true"
talairach coordinates. The MNI talairach atlas does not map to the true
talairach atlas very well, and this attempts to fix it. The
talair
Thank you Doug,
What I have is MEG data in RAS coordinates and I want to convert it to
Talairach.
So I do not have a talairach.xfm file.So how does one do it. will the m
file you gave work without the .xfm file
Ajay
Doug Greve wrote:
If you have the RAS in a vector: v = [R A S 1]';
And the tala
Hi,
You need a talairach.xfm which is a RAS-to-"MNI-Talairach" transform, which
should be present in $subject/mri/transforms (this is the 4x4 affine
transform).
The following site explains the difference between "MNI" talairach and
the "real" talairach space:
http://www.mrc-cbu.cam.ac.uk/Imag
If you have the RAS in a vector: v = [R A S 1]';
And the talairach.xfm matrix X, then MNI talairach cooridnates are:
vMNI = X*v;
These can be computed to something closer to true talairach coords using
the attached mfile, originally from Matthew Brett.
doug
Ajay Pillai wrote:
>
> Hello a
Hello all,
Does any one have a matlab routine to convert given coordinates from RAS
to talarach space.
If not atleas give an indication of how to do it?
Ajay
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