When you say it does not work, what do you mean? Did it not put the label in the right place? The number of vertices in the output label may be much less than in the input. label2label just finds the vertex that is closest to each label point. A multiple input label points may map to a single output label.
doug

On 4/3/13 4:24 PM, Eleonora Maggioni wrote:

Dear Doug,

thank you for the suggestion.

I used the new file that you sent me exactly as in the example 4, but the labels which are effectively translated into the nearest vertex surface labels are few.

I first selected the marker labels on the T1 image within tkmedit. As the labels are outside the head volume, I put the maximum distance --paint as 50 mm, to be sure that the distance is sufficient to find a surface vertex. But anyway is still does not works.

Can this be due to the external position of the markers? Which kind of projection is done by mri_label2label?

Thank you for your support!

Eleonora

2013/4/2 Douglas N Greve <greve@nmr.mgh.harvard.edu>

Hi Eleonora,

the easiest way to do this is to create a label of the electrodes, then
use mri_label2label to map them to the nearest pial vertices. This
ability to map volume labels to nearest surface vertices is broken in
the current version. I've fixed this and put a new version here:

ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/mri_label2label

Run it with --help and use Example 4.
doug

On 04/02/2013 08:19 AM, Eleonora Maggioni wrote:
> Hi Freesurfer experts,
> I am new to FreeSurfer and I have a question.
> I have markers of EEG electrodes on the T1 image of a subject and I
> want to project them from the scalp to his pial surface (that I
> reconstructed using the standard procedure).
> To do so, I manually selected the central point of each marker in
> tkmedit and I defined a control point. Then I red that control point
> with tksurfer on the corresponding pial surface. This should be the
> projection to the pial surface: is this procedure correct? If yes, in
> which coordinate system is the projection made?
> Thank you in advance,
> Kind regards,
>
> --
> Eleonora Maggioni
>
> BioEngineering PhD student
> Politecnico di Milano
> Istituto E.Medea, Bosisio Parini (LC)
>
>
>

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--
Douglas N. Greve, Ph.D.
MGH-NMR Center
greve@nmr.mgh.harvard.edu
Phone Number: 617-724-2358
Fax: 617-726-7422

Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
FileDrop: www.nmr.mgh.harvard.edu/facility/filedrop/index.html
Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/

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--
Eleonora Maggioni

BioEngineering PhD student

Politecnico di Milano

Istituto E.Medea, Bosisio Parini (LC)