As I had issues with FEM headmodel and discussed with you under the thread, I am still attempting with different options, the issue I had before occurred when computing the headmodel with
MRI volume -> head grid, the reason of doing it is that I'd like to extract time series from the deep structure after the inverse solution. Now I found the error is not shown if I change my option to
MRI volume -> brain grid, however, the default setting from the anatomy is
cortex 15000V which has only cortical regions. If I change it to
cortex (FEM) that included deep structure(brainstem and cerebellum, etc) the preview looks good to me as shown in the attached figure.
Is switching from
cortex 15000V to
cortex(FEM) an acceptable way of making headmodel?
If I selected with only the brain grid, does that mean the headmodel computation only uses the mesh of the inner layer without considering the conductivity of the rest four layers?
Would it be a good idea to force the source space to gray layer in this case(compute with brain grid) or it is no longer needed?
As introduced in the tutorial, it is recommended to remesh from simNibs FEM output, since there is no error reported, is it still a compulsory step to do before making headmodel?
Thank you very much for your time and looing forward your reply.