I am working with Dr. Christos Papadelis on an epilepsy project in pediatric patients. We are co-registering our ECoG sensors with the cortex using Brainstorm and then we would like to run source localization by using the ECoG and stereotactic EEG sensors. However, we have been having problems when trying to apply the BEM model.
Any advice or solution you have would be greatly appreciated.
I’ve done some work on sEEG and source if you guys are looking for a collaborators. It was in adults but should be translatable. Email is Andrew.ehrenberg@gmail.com
I have been trying to do "compute head model" for the CT/MRI coregistration, using OpenMEEG BEM for ECOG and SEEG. After I press yes for the openMEEG options, Brainstorm starts processing and then it gives this error:
I have tried to decrease the number of vertices when generating the BEM surface model for the patient, it hasn't work and it kept giving the same error.
When I reached to 362 vertices it gave a different error when trying to use OpenMEEG:
I'm not sure if this is a memory issue, these are the options that I chose for OpenMEEG. I chose the less memory option, but it still did not solve the issue.
PS: If you are using a compiled version a Brainstorm, I’ve just recompiled it.
Update Brainstorm again to get the latest modifications in the compiled version.
We are running Brainstorm from Matlab. I tried what you suggested and installed the new OpenMEEG but I still got the same error.
This is the dropbox .tgz link for the error:
A finite element model is more correct. Even a homogenous sphere may be acceptable. The big issue is that many contacts are in VM and “see” a very different EEG than contacts in GM. Somehow you have to take this into account. In GM you may have very focal activities that even may be uncorrelated to other activities in other parts of GM. I can’t see how you can do source reconstructions on these. Using only VM contacts may be a way for source localization. Connectivity measures should work in both VM and GM contacts
FYI: We improved significantly the tools available in Brainstorm for processing and visualizing SEEG and ECOG data, including new options for volume coregistration. They are now documented in a new tutorial: http://neuroimage.usc.edu/brainstorm/Tutorials/Epileptogenicity