 |
 |
Dear Mailinglist, I am struggeling with a multimodal integration between EEG-Data processing in SPM using freesurfer-generated meshes of cortical ROIs. In order to make a source reconstruction on these ROIS I need them to be coregistered with my forward model which I generate from the individual MRI. The freesurfer mesh in which ROIs are demarcated is also registered to the same MRI but there is a nonlinear spatial deformation done by the freesufer algorithm, making the freesurfer mesh being slightly tilted and shifted compared to the cortical mesh generated by SPM. Any of the 4x4 transformation matrices that are encoded in the freesurfer files don't overcome this shift. The function spm_swarp using the y_....nii file generated by SPM does some shifting to the input (either the freesurfer mesh, or the cortical mesh), but it never completely alignes the freesurfer mesh to any of my SPM-generated files of the T1 (cortex_8196, the vol-struct). I would be very grateful if anyone could give me hints, suggestions ideas how I can nonlinearly warp the two point clouds. Best, Marlene Bönstrup