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Bug 415 - ft_checkcoordsys
| Status |
CLOSED WONTFIX |
| Reported |
2011-01-19 11:58:00 +0100 |
| Modified |
2011-01-26 15:32:07 +0100 |
| Product: |
FieldTrip |
| Component: |
forward |
| Version: |
unspecified |
| Hardware: |
PC |
| Operating System: |
Windows |
| Importance: |
P1 normal |
| Assigned to: |
Jan-Mathijs Schoffelen |
| URL: |
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| Tags: |
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| Depends on: |
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| Blocks: |
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| See also: |
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Lilla Magyari - 2011-01-19 11:58:06 +0100
Hi J-M,
In the anatomical processing pipeline, ft_checkcoordsys should make the transformation of the cortical sheet (source space) from one coordinate system (FS, MNE Suite) to the other (FT, subject's headspace).
Lilla
Jan-Mathijs Schoffelen - 2011-01-21 16:38:24 +0100
Hmm, this was indeed the original plan. Yet, the transformation needs some amount of user interaction, and therefore I think ft_volumerealign is the place to implement this. For now it supports (implicitly) conversion between CTF-based and Talairach-based coordinate systems. It looks as if Freesurfer manages Talairach-based coordinate systems quite well, without the need of explicitly using the Freesurfer coordinate system conventions (are handled within Freesurfer).
At the moment ft_volumerealign also outputs a transformorig (which is the original coregistration matrix). The transformation from the old-coordsys to the new-coordsys can be achieved by:
T = mri.transform*inv(mri.transformorig);
Also, see: http://fieldtrip.fcdonders.nl/development/minimum_norm_estimate_in_fieldtrip