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. Author manuscript; available in PMC: 2013 Feb 15.
Published in final edited form as: Neuroimage. 2011 Nov 28;59(4):3563–3570. doi: 10.1016/j.neuroimage.2011.11.046

Figure 3. Outline of electrode localization and intersubject mapping procedure.

Figure 3

(A) The preoperative MRI is coregistered with the postoperative CT volume. The lower panel shows the maximal intensity projection of the CT volume in the sagittal dimension, which shows all the electrodes in a sagittal plane. (B) Due to the parenchymal shift from the implant procedure, some electrodes initially appear as though buried in the gray matter. To correct for this, each electrode coordinate is projected first to a smoothed pial surface (effectively a dural surface) and subsequently back to the pial surface. (C) 2D registration with the Freesurfer average brain. An inflated spherical surface is computed from the individual’s pial surface and aligned with that of the Freesurfer average. (D) Projection of each electrode coordinate from the individual’s pial surface to that of the Freesurfer average.