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Hi Nick,
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<div class="">Sounds like you need a transformation matrix from freesurfer space to MEG headspace, true?</div>
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<div class="">is there a c_ras.mat file in your freesurfer/mri directory? This may provide you with the missing link</div>
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<div class="">Best,</div>
<div class="">JM</div>
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J.M.Schoffelen, MD PhD<br class="">
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Telephone: +31-24-3614793</div>
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<div class="">On 08 Mar 2017, at 17:48, Nicholas A. Peatfield <<a href="mailto:nick.peatfield@gmail.com" class="">nick.peatfield@gmail.com</a>> wrote:</div>
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<div dir="ltr" style="font-family:sans-serif;font-size:13.696px" class="">Hi Fieldtrippers
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<div class="">I want to reconstruct cortical sources using a freesurfer surface, rather than an equidistant grid I will use the points from the surface. To do so I use ft_read_headshape to read the .surf file and use it as the points for the leadfield. However,
the MEG data and headmodel are in 'bti' coordinates thus the grid points are not aligned to the headmodel and sensor points. </div>
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<div class="">I read the minimum norm estimate tutorial from fieldtrip webpage for transforming spm coordinates to bti, but in my case I am using a surface file in which there are only the points and tri.gonometries and the tutorial doesn't apply.</div>
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<div class="">How can I convert the surface points to bti? This is HCP data and I thought I would find some help on this somewhere but couldn't.</div>
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<div class="">Cheers,</div>
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<div dir="auto" class="">Nick</div>
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