Hi Denis, The transformation matrices that are provided by the MEG team will not allow for this registration. I think you should ask that structural processing team, they might provide the registration information from the original 0.7mm T1w image to the freesurfer images.
Best, Jan-Mathijs On May 15, 2015, at 3:44 PM, Denis-Alexander Engemann <[email protected]> wrote: > > I was wondering wheather the transforms would be suitable for mapping the > freesurfer surface coordinates to the helmet space. > If this step would work, the transforms and the coreg would be usable with > other software such as for example the MNE suite. > We could then write a routine that skips the regular conversion of BTI files > and adds identity matrices instead to the related transform fields that > usually map from BTI to Neuromag space. The transforms provided could then be > used to map the sensors to the source models created in MNE. > > > Any hint wold be appreciated. > > Best, > Denis > > > > 2015-05-15 15:35 GMT+02:00 Georgios Michalareas > <[email protected]>: > 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 >> >> _______________________________________________ >> HCP-Users mailing list >> [email protected] >> http://lists.humanconnectome.org/mailman/listinfo/hcp-users >> > > > > > This email is free from viruses and malware because avast! Antivirus > protection is active. > > > _______________________________________________ > HCP-Users mailing list > [email protected] > http://lists.humanconnectome.org/mailman/listinfo/hcp-users > > > _______________________________________________ > HCP-Users mailing list > [email protected] > http://lists.humanconnectome.org/mailman/listinfo/hcp-users > _______________________________________________ HCP-Users mailing list [email protected] http://lists.humanconnectome.org/mailman/listinfo/hcp-users
