Cortical Surface Reconstruction and Electrode Localization

Preoperative anatomic MRI scans were obtained using a 3T whole-body MR scanner (Philips Medical Systems) fitted with a 16-channel SENSE head coil. Images were collected using a magnetization-prepared 180° radio frequency pulse and rapid gradient-echo sequence with 1 mm sagittal slices and an in-plane resolution of 0.938 × 0.938 mm (Conner et al., 2011 (link)). Pial surface reconstructions were computed with FreeSurfer (v5.1; Dale et al., 1999 (link)) and imported to AFNI (Cox, 1996 (link)). Postoperative CT scans were registered to the preoperative MRI scans to localize electrodes relative to cortex. Subdural electrode coordinates were determined by a recursive grid partitioning technique and then validated using intraoperative photographs (Pieters et al., 2013 (link)).

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Giahi Saravani A., Forseth K.J., Tandon N, & Pitkow X. (2019). Dynamic Brain Interactions during Picture Naming. eNeuro, 6(4), ENEURO.0472-18.2019.

Publication 2019

3T whole-body MR scanner 16-channel SENSE head coil

Body Cortex Ct scans Echo Head Mri scans Pulse Reconstructions Subdural

Corresponding Organization :

Other organizations : Baylor College of Medicine, The University of Texas Health Science Center at Houston, Rice University, Memorial Hermann, Texas Medical Center

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Variable analysis

independent variables

Preoperative anatomic MRI scans using a 3T whole-body MR scanner

dependent variables

Pial surface reconstructions computed with FreeSurfer
Subdural electrode coordinates determined by a recursive grid partitioning technique

control variables

Philips Medical Systems 3T whole-body MR scanner fitted with a 16-channel SENSE head coil
Magnetization-prepared 180° radio frequency pulse and rapid gradient-echo sequence with 1 mm sagittal slices and an in-plane resolution of 0.938 × 0.938 mm
Postoperative CT scans registered to the preoperative MRI scans to localize electrodes relative to cortex
Subdural electrode coordinates validated using intraoperative photographs

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