Fig. 3
From: B(RAIN)2—BRAIN integrated Resource for Anatomy and Intracranial Neurophysiology

Steps involved in ECoG localization. (a) The final alignment of DBS electrode paths and stereotactic frame pin tips on the intraoperative fluoroscopic image based on coregistered CT scans, with manual pinning of ECoG locations on the fluoroscopic image. (b) Visualization of ECoG electrode locations projected onto a reconstructed cortical surface, segmented using the FreeSurfer Desikan-Killiany-Tourville (DKT) atlas. (c,d) Localization marks for DBS electrode tracts on postoperative CT and stereotactic frame pins on preoperative CT, respectively, with violet dots indicating electrode and pin locations. (e,f) Skull removal near the in situ ECoG strip and noise reduction, producing a unified 3D model of the ECoG strip and skull for final localization within the same anatomical space for cases using O-arm imaging instead of intraoperative fluoroscopy.