12 Sep
2013
12 Sep
'13
7:07 p.m.
The 4th handles any translation. The 3x3 handles rotation and any scale.
On 9/11/13 10:21 AM, Garikoitz Lerma-Usabiaga wrote:
Hi Doug, just a very naive question about coordinate change: why do we need the fourth component? I mean, shouldn't be the transformation matrix 3x3 instead of 4x4 for a coordinate change in 3D space? thanks! Gari
On Wed, Sep 11, 2013 at 12:52 AM, Douglas N Greve <greve@nmr.mgh.harvard.edu mailto:greve@nmr.mgh.harvard.edu> wrote:
Hi Yang, I've computed a matrix that should do the trick. If you are in matlab, then M = [ 0.9975 -0.0073 0.0176 -0.0429 0.0146 1.0009 -0.0024 1.5496 -0.0130 -0.0093 0.9971 1.1840 0 0 0 1.0000] P305 = [MNI305x MNI305y MNI305z 1]'; P152 = M*P305 Can you give this a shot and see if it makes sense? It will probably be hard to tell since the matrix is pretty close to identity. doug On 09/10/2013 05:17 PM, Yang, Daniel wrote: > Thanks, Doug. I am really hoping to get MNI152 (because I also use > fsl). Are MNI305 and MNI152 the same? How can I obtain MNI152 coordinates? > > Best, > Daniel > > -- > Yung-Jui "Daniel" Yang, PhD > Postdoctoral Researcher > Yale Child Study Center > New Haven, CT > (203) 737-5454 > > On 9/10/13 5:14 PM, "Douglas N Greve" <greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu> > <mailto:greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>>> wrote: > > > It is an estimate of Tal coords from the MNI305. See > > http://imaging.mrc-cbu.cam.ac.uk/imaging/MniTalairach > > If you want MNI305, run mri_surfcluster with --nofixmni > > doug > > > > On 09/10/2013 05:08 PM, Yang, Daniel wrote: > > Hi all, > > The output of mri_surfcluster --sum shows TalX TalY TalZ. I am > wondering if they are based on the Talairach system or some > sort of > MNI-Talairach system. If the latter, can you tell me something > more > about it? Like a webpage that describes its relationship > between the > MNI152 or the Talairach system? > > I find it confusing because mri_surfcluster said: "INFO: > fixing MNI > talairach coordinates" > > Thanks! > Daniel > > -- > Yung-Jui "Daniel" Yang, PhD > Postdoctoral Researcher > Yale Child Study Center > New Haven, CT > (203) 737-5454 > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu> > <mailto:Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu>> > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > -- > Douglas N. Greve, Ph.D. > MGH-NMR Center > greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu> <mailto:greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>> > Phone Number: 617-724-2358 > Fax: 617-726-7422 > > Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting <http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting> > FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 > www.nmr.mgh.harvard.edu/facility/filedrop/index.html <http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html> > Outgoing: > ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu> <mailto:Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu>> > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > The information in this e-mail is intended only for the person to > whom it is > addressed. If you believe this e-mail was sent to you in error and > the e-mail > contains patient information, please contact the Partners > Compliance HelpLine at > http://www.partners.org/complianceline . If the e-mail was sent to > you in error > but does not contain patient information, please contact the > sender and properly > dispose of the e-mail. > > -- Douglas N. Greve, Ph.D. MGH-NMR Center greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu> Phone Number: 617-724-2358 Fax: 617-726-7422 Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting <http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting> FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 www.nmr.mgh.harvard.edu/facility/filedrop/index.html <http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html> Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer