Overview

14 y/o girl with 5 days of scalp EEG, intracranial grid EEG (58 electrodes), and standard depth EEG (6 electrodes) EEG. She had right anterior lobectomy. Pathology showed low grade glioma. Had Class I outcome.

The electrodes in the seizure onset zones are: [ 3:6 33 ].
The electrodes in the resected volume are: [ 1:6 27:44 ].

File Information

EEG data and metadata are stored in the files.

TXT files

• database-patientID-sessionNumber.chanHdr.txt: Meta data on the channels used
  • nChan: Number of active channels
  • nChanTot: Total number of channels
  • macro: Macroelectrodes
  • micro: Microelectrodes
  • depth: Intracranial grid electrodes
  • ECoG: Intracranial grid electrodes
  • external: Scalp electrodes
  • chanMap: Electrodes indicated in the channel map
• database-patientID-sessionNumber.clinHdr.txt: Clinical meta data
  • knowSOZ: Whether the seizure onset zone was known
  • knowIfResected: Whether there will be resection
  • didResect: Whether there was resection
  • knowResectedVol: Whether the resected volume was known
  • knowOutcome: Whether the patient oucome was known
  • ILAE_outcome: Epilepsy surgery seizure outcome using the International League Against Epilepsy (ILAE) Outcome Scale
  • RV: Electrodes placed in the resected volume
  • SOZ: Electrodes placed in the seizure onset zone
  • highIIS: Electrodes placed at locations with interictal spikes

DOCX files

• database-patientID.LTM.docx: De-identified copy of clinical and hospitalization record
• database-patientID.surgical-report.docx: Surgical report
• database-patientID.pathology.docx: Pathology information
• database-patientID.electrode-placement.docx: Electrode placement

PPT files

These files contain clinical information.

LAY files

These files contain Persyst EEG data.

DAT files

These files contain Persyst EEG data.

MATLAB code

• MAT files contain EEG metadata.
• MinutesFromStart.mat contains the duration (minutes) from the first EEG sample of the patient to the first EEG sample taken in each session.
• LAY files can be read with inifile.m, lay_data_read.m, and lay_hdr_read.m.

Usage

• Ensure that the codes are in the active folder or in your MATLAB path.
• Change the false to true if you want to read the annotations into the header. Not recommended for long clinical EEG.
• The startIdx and stopIdx are the indexes from the .dat file you are interested in. For the start of the file, startIdx=1. For the end of the file, stopIdx = hdr.datapoints.

  hdr = lay_hdr_read(filename,false);  
  data = lay_data_read(hdr,startIdx,stopIdx);