I have found an artifact on an MRI that our team believes to be MRI-compatible goggles for a person who regularly wears glasses. The artifact seems to be causing a bulge in the head model that is created of the participant's head, and one of our EEG sensors is located directly on top of the artifact. Do you have any advice for how to manage this artifact, any suggestions to get rid of it, or information as to whether it is even an issue? There are screenshots attached. The objects on the skin are present on both sides.
Thank you in advance for your time! I really appreciate it.
Is the EEG data acquired within the MRI system?
Or are you doing the co-registration between an MRI and EEG cap?
One possible solution is to export this surface and then smooth the head surface so this artifact can be cleaned or identify the artifact vertices and move them to fit the skin surface.
Hey Takfarinas,
The EEG is not acquired within the MRI. I am co-registering the EEG to the MRI. We use CapTrak to localize the electrodes better to the MRI.
Thank you for your suggestion. When you say export the surface, do you mean export it to another software outside Brainstorm? Or is this possible within Brainstorm?
Would another option be to generate the head model with less vertices? Right now, the BEM surfaces are generated using the default 1922v for all three surfaces: scalp, inner skull, outer skull. Perhaps I could use less vertices for the scalp, and keep the skull vertices the same?
indeed, you need to export the surface file to matlab or any other tools that allow you to proces the surface. We will add some basic function to process the mesh in the future releases.
yes, you can; you click on the surface and then use then try both options, "mesh" or "less vertices," and check the shape of the outputs.
