Epimap tutorial dataset

Description

This dataset includes recordings for a patient that was not reported in associated articles ([David_2011], [Lamarche_2016]), but is part of the same study. The patient presents a focal epilepsy of the left temporo-occipital junction, MRI-negative, and was implanted in the surrounding areas. The subfolder “seeg” contains the recordings of three seizures, all of them showing a propagation of high-frequency oscillations from the lesion towards the temporal lobe, bilaterally.

Data files

The dataset is stored in a folder called “Epimap tutorial dataset” located inside the “tutorial_data” folder accessible from the Private Space. It includes the following files:

  • /anat/MRI/3DT1*_deface.nii: Subject T1 MRI before and after SEEG implantation, de-identified with FreeSurfer’s mri_deface

  • /anat/MRI/brainvisa: Cortical surface extracted with BrainVISA 4.5

  • /anat/implantation/*.txt: Positions of the sEEG contacts in various formats (MNI coordinates or subjecy coordinates)

  • /seeg/SZ*.TRC: Seizure recordings in Micromed format, one seizure per file

It can also be downloaded from the original publisher on f-tract.eu.

Electrode description

The depth electrodes used in this example dataset are DIXI D08-**AM Microdeep electrodes, with the following specifications:

  • Diameter: 0.8 mm

  • Contact length: 2 mm

  • Insulator length: 1.5 mm

  • Distance between the center of two contacts: 3.5 mm

  • Between 8 and 18 contacts on each electrode

License

This tutorial dataset is the property of the Grenoble University Hospital, France. Its use and transfer outside the ImaGIN tutorial, e.g. for research purposes, is prohibited without written consent. For questions, please contact Olivier David, PhD.

References

The acquisition methodology is described in the following articles :

David_2011

David O, Blauwblomme T, Job AS, Chabardès S, Hoffmann D, Minotti L, Kahane P. “Imaging the seizure onset zone with stereo-electroencephalography Brain.” Brain., 2011: 134(10):2898-911.

Lamarche_2016

Lamarche F, Job AS, Deman P, Bhattacharjee M, Hoffmann D, Gallazzini-Crépin C, Bouvard S, Minotti L, Kahane P, David O. “Correlation of FDG-PET hypometabolism and SEEG epileptogenicity mapping in patients with drug-resistant focal epilepsy Epilepsia.” Epilepsia., 2016: 57(12):2045–2055.