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Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging
Published on: November 8, 2012
Postictal diffusion weighted imaging
Tuuli M Salmenpera1, Mark R Symms, Philip A Boulby
1The MRI Unit, The National Society for Epilepsy and the Department of Clinical and Experimental Epilepsy, Institute of Neurology, Queen Square, University College London, London, UK.
Epilepsy Research
|May 19, 2006
Summary
Diffusion weighted imaging detected changes in mean diffusivity (MD) after seizures in epilepsy patients. These MD changes, observed post-seizure, indicate affected brain networks but are not reliable for pinpointing seizure origins.
Area of Science:
- Neuroimaging
- Epilepsy Research
- Diffusion Weighted Imaging
Background:
- Intractable focal epilepsy poses challenges for seizure localization.
- Understanding post-seizure brain changes is crucial for epilepsy management.
Purpose of the Study:
- To assess diffusion weighted imaging's ability to detect diffusivity abnormalities after seizures.
- To investigate the location and temporal evolution of these postictal changes.
Main Methods:
- Utilized voxel-based statistical parametric mapping to analyze mean diffusivity (MD) changes.
- Compared postictal MD in 21 epilepsy patients with 20 healthy controls.
- Evaluated the time course and magnitude of MD changes post-seizure.
Main Results:
- Detected 34 focal MD changes (decreases and increases) after 12 of 23 seizures in 11 patients.
- Postictal changes were observed in 52% of seizures, with a median interval of 53 minutes.
- MD changes showed a trend towards interictal values upon repeated scanning.
Conclusions:
- Diffusion weighted imaging can identify focal diffusivity changes after seizures.
- These changes may reflect involved brain networks rather than precise seizure foci.
- The technique shows limited promise for direct seizure focus localization.
