Re: [Freesurfer] Correspondence of Talairach coordinates from one subject to other

2013-03-19 Thread Garikoitz Lerma-Usabiaga
Hi Doug, I tried to do what you recommended but I am encountering an inconsistency. (Note: I obtain the same results in R (with ginv() ) and Matlab (with pinv() ) ) Could you please have a look at the code and the values please? I don't know what else to do right now... (it is possible to copy p

Re: [Freesurfer] Correspondence of Talairach coordinates from one subject to other

2013-03-13 Thread Garikoitz Lerma-Usabiaga
Thanks Doug, the problem is that I have a volume overlay. When I register avg305T1.nii with Colin27 I have a different register matrix than when using single_subject_T1.nii. Do you think that this procedure will work (scripted for every subject)? - *bbregister --s Colin27 --mov S_01 --init-spm -

Re: [Freesurfer] Correspondence of Talairach coordinates from one subject to other

2013-03-13 Thread Douglas Greve
Hi Gary, you would use the MNI305 space as the common space. Eg, Case 2 shows you how to go from RAS of a subject to MNI305 space. You would reverse that to go from MNI305 space to another subject's RAS space thus allowing a RAS-RAS transform. If you have a surface overlay for a subject, you ca

Re: [Freesurfer] Correspondence of Talairach coordinates from one subject to other

2013-03-12 Thread Garikoitz Lerma-Usabiaga
Thanks Doug, I've seen the page, but I understand that everything is within the same subject. I want to find the equivalencies between subjects. I mean, the plane y = 30 in fsaverage, will correspond to a plane with a bigger Y for a larger head (could be defined anatomically, the most outer point o

Re: [Freesurfer] Correspondence of Talairach coordinates from one subject to other

2013-03-12 Thread Douglas Greve
Hi Gary, check out this wiki page and let me know if you still have questions http://surfer.nmr.mgh.harvard.edu/fswiki/CoordinateSystems doug On 3/12/13 8:04 PM, Garikoitz Lerma-Usabiaga wrote: Hi! how can I translate a coordinate in talairach space of one subject (Colin27), to every subject i

[Freesurfer] Correspondence of Talairach coordinates from one subject to other

2013-03-12 Thread Garikoitz Lerma-Usabiaga
Hi! how can I translate a coordinate in talairach space of one subject (Colin27), to every subject in a study? For example, I would like to know where is the coordinate Y = +30 Talairach of Colin27 in Subject_00, Subject_01, etc. Should I use vol2vol to create a volume for every subject? Is there