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<span style="font-family:Arial">Dear experts, </span></p>
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<span style="font-family:Arial">I am working on relating 7T quantitative MRI to MEG.
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<span style="font-family:Arial">I have been following this tutorial <a href="http://www.fieldtriptoolbox.org/tutorial/sourcemodel/">
http://www.fieldtriptoolbox.org/tutorial/sourcemodel/</a></span></p>
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<span style="font-family:Arial">However I want to run freesurfer on my 7T image and then transform the source model to CTF space.
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<span style="font-family:Arial">I did the following steps</span></p>
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<span style="font-family:Arial">1. I ran freesurfer on my 7T mp2rage.nii (-hires pipeline)
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<span style="font-family:Arial"> </span></p>
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<span style="font-family:Arial">2. Then I register my 7T mp2rage.nii to the CTF realigned mp2rage.nii to generate a transform (using nifiti_reg) - </span></p>
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<span style="font-family:Arial">%% Load transform</span></p>
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<span style="font-family:Arial">transform_fs2ctf = load(fullfile(mri_path,'fs_ctf.txt'));
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<span style="font-family:Arial"> </span></p>
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<span style="font-family:Arial">I then tried to use this transform to put the sourcemodel into CTF space</span></p>
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<span style="font-family:Arial"> </span></p>
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<span style="font-family:Arial">%% Refine and save source model</span></p>
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<span style="font-family:Arial">sourcemodel = ft_transform_geometry(transform_fs2ctf, sourcemodel);</span></p>
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<span style="font-family:Arial"> </span></p>
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<span style="font-family:Arial">However I get the following error:</span></p>
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<span style="font-family:Arial"> </span></p>
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<span style="font-family:Arial">Error using ft_transform_geometry (line 65)</span></p>
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<span style="font-family:Arial">only a global rescaling is allowed. </span></p>
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<span style="font-family:Arial"> </span></p>
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<span style="font-family:Arial">(transform file attached). </span></p>
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<span style="font-family:Arial"> </span></p>
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<span style="font-family:Arial">Any idea why this is happening? </span></p>
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<span style="font-family:Arial">I have also tried to use the transform from:</span></p>
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<span style="font-size:10.0pt; font-family:Courier; color:forestgreen">%% Relign anatomical MRI to MEG</span><span style="font-family:Courier"></span></p>
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<span style="font-size:10.0pt; font-family:Courier; color:black">cfg<span style="">
</span>= [];</span><span style="font-family:Courier"></span></p>
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<span style="font-size:10.0pt; font-family:Courier; color:black">cfg.method<span style="">
</span>= </span><span style="font-size:10.0pt; font-family:Courier; color:#A020F0">'interactive'</span><span style="font-size:10.0pt; font-family:Courier; color:black">;</span><span style="font-family:Courier"></span></p>
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<span style="font-size:10.0pt; font-family:Courier; color:black">cfg.coordsys = </span>
<span style="font-size:10.0pt; font-family:Courier; color:#A020F0">'ctf'</span><span style="font-size:10.0pt; font-family:Courier; color:black">;</span><span style="font-family:Courier"></span></p>
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<span style="font-size:10.0pt; font-family:Courier; color:black">mri<span style="">
</span>= ft_volumerealign(cfg, mri);</span><span style="font-family:Courier"></span></p>
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<span style="font-family:Arial"> </span></p>
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<span style="font-family:Arial">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
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<span style="font-family:Arial">Thanks</span></p>
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<span style="font-family:Arial"> Peter</span></p>
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