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fMRI of Epilepsy

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Functional Neuroradiology

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Abstract

This review concentrates on functional MRI (fMRI) methods to identify the epileptic focus; i.e., ictal and interictal fMRI. First, established clinical applications of fMRI in the field of epilepsy are briefly introduced: fMRI of sensorimotor, language, and memory functions can be considered already as clinically relevant tools to identify eloquent cortex and to predict postoperative functional deficits in patients considered for epilepsy surgery. Functional MRI offers a valid alternative to invasive methods such as the Wada test for establishing language dominance, and it is likely that it will also replace the Wada test for assessing presurgical memory function in the nearer future.

Ictal fMRI (fMRI studies of epileptic seizures) will remain limited to exceptional cases due to practical limitations. The generators of interictal epileptiform discharges (IED) can be studied with EEG-correlated fMRI. Despite its technical challenges, it has proved useful to provide insights into the generation of IED in patients with focal and generalized epilepsy. In selected patients with focal IED, EEG-correlated fMRI has the potential to reproducibly identify cortical areas involved in generating IED; i.e., the irritative zone. In patients with generalized IED, suspension of functional networks due to the IED can be demonstrated.

The utility of EEG-correlated fMRI in clinical epileptology cannot be definitely determined yet.

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Authors and Affiliations

  1. Asklepios Neurologische Klinik Falkenstein, Asklepiosweg 15, Königstein, 61462, Germany

    Karsten Krakow MD, PhD (Medical Director)

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  1. Karsten Krakow MD, PhD
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Correspondence to Karsten Krakow MD, PhD .

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Editors and Affiliations

  1. Temple University School of Medicine, 3401 Broad Street, Philadelphia, 19140-5189, Pennsylvania, USA

    Scott H. Faro

  2. Dept. of Radiology, Temple University Hospital, 3401 Broad Street, Philadelphia, 19140-5189, Pennsylvania, USA

    Feroze B. Mohamed

  3. , Radiology, University of Southern California School, Zonal Avenue 1975, Los Angeles, 90033, California, USA

    Meng Law

  4. , Department of Radiology, Medical College of Wisconsin, Watertown Plank Road 8701, Milwaukee, 53226, USA

    John T. Ulmer

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Krakow, K. (2011). fMRI of Epilepsy. In: Faro, S., Mohamed, F., Law, M., Ulmer, J. (eds) Functional Neuroradiology. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-0345-7_30

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  • DOI: https://doi.org/10.1007/978-1-4419-0345-7_30

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