Dear Beth,
the head shape files are not provided with the data.
The reason for this is that headshape digitization includes points
around the nose, the eyes, the forehead and the entire head. This means
that this information could lead to identification of a subjects identity.
This is also the reason why the structural MR images provided by the MR
modality have also such external features stripped off the data in order
to avoid a possible subject identification.
Following this constraint, in the MEG team we provide both surface(2D)
and volumetric(3D) source models so that the community can perform
source localization on them.
You can find them in the anatomy directory of the released data.
The surface source model is called
177746_MEG_anatomy_sourcemodel_2d.mat
while there are 3 volumetric models with different voxel sizes (4,6,8 mm)
177746_MEG_anatomy_sourcemodel_3d4mm.mat
177746_MEG_anatomy_sourcemodel_3d6mm.mat
177746_MEG_anatomy_sourcemodel_3d8mm.mat
I hope this helps.
Let me know for anything else.
Giorgos
On 15/05/2015 15:18, Elizabeth Anne Bock, Ms wrote:
I just downloaded the MEG data from the 500 Subjects + MEG2 Data
Release. I see from the documentation that the MEG data should
include a head shape file. This is not present in my downloaded set.
Where can I get these?
Thanks,
Beth
------------------------------------------------------------------------------------------
Elizabeth Bock / MEG System Engineer
McConnell Brain Imaging Centre / Montreal Neurological Institute
McGill University / 3801 University St. / Montreal, QC H3A 2B4
MEG Lab: 514.398.6056
Mobile: 514.718.6342
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