[FieldTrip] Registering freesurfer soucremodel to CTF space

[McColgan, Peter]

Dear experts,



I am working on relating 7T quantitative MRI to MEG.



I have been following this tutorial http://www.fieldtriptoolbox.org/tutorial/sourcemodel/



However I want to run freesurfer on my 7T image and then transform the source model to CTF space.



I did the following steps



1. I ran freesurfer on my 7T mp2rage.nii (-hires pipeline)



2. Then I register my 7T mp2rage.nii to the CTF realigned mp2rage.nii to generate a transform (using nifiti_reg) -



%% Load transform

transform_fs2ctf = load(fullfile(mri_path,'fs_ctf.txt'));



I then tried to use this transform to put the sourcemodel into CTF space



%% Refine and save source model

sourcemodel = ft_transform_geometry(transform_fs2ctf, sourcemodel);



However I get the following error:



Error using ft_transform_geometry (line 65)

only a global rescaling is allowed.



(transform file attached).



Any idea why this is happening?

I have also tried to use the transform from:

%% Relign anatomical MRI to MEG

cfg          = [];

cfg.method   = 'interactive';

cfg.coordsys = 'ctf';

mri          = ft_volumerealign(cfg, mri);



I have also tried to run freesurfer on after realigning the MRI ctf, then to acpc as in the tutorial however freesurfer fails on the 7T images

Thanks

 Peter












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