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Brain Topography

, Volume 31, Issue 2, pp 322–336 | Cite as

Two-Dimensional Temporal Clustering Analysis for Patients with Epilepsy: Detecting Epilepsy-Related Information in EEG-fMRI Concordant, Discordant and Spike-Less Patients

  • Danilo Maziero
  • Tonicarlo R. Velasco
  • Carlos E. G. Salmon
  • Victoria L. Morgan
Original Paper
  • 136 Downloads

Abstract

EEG acquired simultaneously with fMRI (EEG-fMRI) is a multimodal method that has shown promise in mapping the seizure onset zone in patients with focal epilepsy. However, there are many instances when this method is unsuccessful or not applicable, and other data driven fMRI methods may be utilized. One such method is the two-dimensional temporal clustering analysis (2dTCA). In this study we compared the classic EEG-fMRI and 2dTCA performance in mapping regions related to the seizure onset region in 18 focal epilepsy patients (12 presenting interictal epileptiform discharges (IEDs), during EEG-fMRI acquisition) with Engel I or II surgical outcome. Activation maps of both 2dTCA timing outputs (positive and negative histograms) and EEG detected IEDs were computed and compared to the region of epilepsy surgical resection. Patients were evaluated in three categories based on frequency of EEG detected spiking during the MRI. EEG-fMRI maps were concordant to the epilepsy region in 5/12 subjects, four with frequent IEDs on EEG. The 2dTCA was successful in mapping 13/18 patients including 3/6 with no IEDs detected (10/12 with IEDs detected). The epilepsy-related activities were successfully mapped by both methods in only 4/12 patients. This work suggests that the epilepsy-related information detected by each method may be different: while EEG-fMRI is more accurate in patients with high rather than lower numbers of EEG detected IEDs; 2dTCA can be useful in evaluating patients even when no concurrent EEG spikes are detected or EEG-fMRI is not effective. Therefore, our results support that 2dTCA might be an alternative for mapping epilepsy-related BOLD activity in negative EEG-fMRI (6/7 patients) and spike-less patients.

Keywords

Epilepsy 2dTCA EEG-fMRI Interictal epileptiform discharges 

Notes

Acknowledgements

This study was supported by Grants from the National Council for Scientific and Technological Development (CNPq), Brazil. VLM is supported by the National Institute of Health (R01 NS75270), United States of America.

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Copyright information

© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  • Danilo Maziero
    • 1
    • 2
    • 3
  • Tonicarlo R. Velasco
    • 3
  • Carlos E. G. Salmon
    • 2
  • Victoria L. Morgan
    • 4
  1. 1.Neuroscience & MR Research Program, Department of Medicine, John A. Burns School of MedicineUniversity of HawaiiHonoluluUSA
  2. 2.InBrain Lab, Department of Physics, FFLCRPUniversity of São PauloRibeirão PrêtoBrazil
  3. 3.Epilepsy Surgery Center, Department of Neuroscience, Faculty of MedicineUniversity of São PauloRibeirão PrêtoBrazil
  4. 4.Institute of Imaging ScienceVanderbilt UniversityNashvilleUSA

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