Display of Subdural Strip and Grid Electrodes in Patients with Cortical Dysplasia Using Curvilinear Reconstruction of 3D Data Sets
Abstract number :
1.252
Submission category :
Year :
2001
Submission ID :
2825
Source :
www.aesnet.org
Presentation date :
12/1/2001 12:00:00 AM
Published date :
Dec 1, 2001, 06:00 AM
Authors :
A. Schulze-Bonhage, MD, Epileptology, University of Freiburg, Freiburg, Baden-Wuerttemberg, Germany; H.J. Huppertz, MD, Epileptology, University of Freiburg, Freiburg, Baden-Wuerttemberg, Germany; J. Honegger, MD, Neurosurgery, University of Freiburg, Fre
RATIONALE: In the planning of epilepsy surgery in patients investigated with invasive EEG electrodes, the exact localization of subdural electrodes is essential. Planar MR sections often pose problems of localization of subdural electrodes due to the convexity of the underlying cortical surface. In the present study, the curvilinear reconstruction of 3D MRI data sets is evaluated with respect to possible advantages in the display of topographic relations between electrodes and cortical dysplasia.
METHODS: 3D MR data sets (MPRAGE sequence) from 10 patients with cortical dysplasia implanted with subdural strip and/or subdural grid electrodes were reformatted interactively using a commercially available software (Brainsight; rf. Bastos et al., Ann. Neurol. 46 (1999) 88-94). Topographic relationships between surface gyration, cortical dysplasia, and subdural electrodes were investigated using serial convex MR sections parallel to the cortical surface. Results were compared to the interpretation of conventional planar sections.
RESULTS: After curvilinear reconstruction of MR data, the relative position of electrodes with regard to cortical gyri and sulci and to cortical dysplasia was markedly improved. The reconstruction also allowed to project electrode positions also to dysplastic regions in the depth of the cortex. In addition, the possibility to use different angles of view contributed to an improved planning of subsequent neurosurgical procedures.
CONCLUSIONS: Curvilinear reconstruction of 3D MR data sets is a new method which can improve the display of topographic relations between subdural electrodes and dysplastic cortical areas.