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Network Analysis of the Default Mode Network Using Functional Connectivity MRI in Temporal Lobe Epilepsy
Published on: August 5, 2014
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Temporal lobe epilepsy with or without hippocampal sclerosis: Structural and functional connectivity using advanced
Dong Ah Lee1, Ho-Joon Lee2, Hyung Chan Kim1
1Department of Neurology and Radiology, Haeundae Paik Hospital, Inje University College of Medicine, Busan, Republic of Korea.
Summary
Temporal lobe epilepsy (TLE) patients with hippocampal sclerosis (HS) show a more disconnected functional brain network compared to those without HS, as revealed by arterial spin labeling MRI. Structural connectivity remained similar between groups.
Area of Science:
- Neuroimaging
- Epilepsy research
- Brain connectivity
Background:
- Temporal lobe epilepsy (TLE) is a common neurological disorder.
- Hippocampal sclerosis (HS) is a frequent comorbidity in TLE, affecting brain structure and function.
- Understanding connectivity differences in TLE with and without HS is crucial for diagnosis and treatment.
Purpose of the Study:
- To investigate differences in structural and functional brain connectivity between TLE patients with and without HS.
- To utilize diffusion tensor imaging (DTI) for structural connectivity and arterial spin labeling (ASL) MRI for functional connectivity analysis.
- To compare network parameters using graph theoretical analysis.
Main Methods:
- Recruited 50 TLE patients (25 with HS, 25 without HS) for brain MRI.
- Acquired DTI and ASL data to assess structural and functional connectivity, respectively.
- Applied graph theory to calculate global and local network measures, including radius, diameter, and efficiency.
Main Results:
- No significant differences in structural connectivity measures were found between TLE groups with and without HS.
- Significant differences in functional connectivity were observed, with increased radius and diameter in TLE patients with HS.
- These functional connectivity alterations suggest a more disrupted network in TLE patients with HS.
Conclusions:
- Functional brain networks differ significantly between TLE patients with and without HS.
- TLE patients with HS exhibit a more disconnected functional brain network.
- ASL MRI can identify functional connectivity deficits in TLE associated with HS.
