Hippocampal deformation-based shape analysis in epilepsy and unilateral mesial temporal sclerosis
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Published on: July 2, 2014
R Edward Hogan1, Richard D Bucholz, Sarang Joshi
1Department of Neurology Division of Neurosurgery, Saint Louis University, St Louis, Missouri 63110, USA. hoganr2@slu.edu
Purpose:
To assess shape changes in patients with mesial temporal sclerosis (MTS) and temporal lobe epilepsy (TLE), by using deformation-based hippocampal shape analysis.
Methods:
We retrospectively reviewed magnetic resonance imaging (MRI) studies in 30 subjects with unilateral MTS (15 right-sided MTS, 15 left-sided MTS) and TLE. We defined the "average" hippocampus in the right- and left-MTS groups by generating a mean transformation for the 15 deformation images in each group. Further to quantify the difference between the hippocampi, we coregistered the mean transformation of the involved hippocampus (with MTS) to the contralateral hippocampus, considering the left- and right-MTS groups independently. We generated a color "flame" scale showing degrees of outward and inward deviation of the coregistered hippocampi.
Results:
Both the right- and left-MTS groups showed similar shape changes, with maximal inward deformation in the medial and lateral hippocampal head and the hippocampal tail. However, more extensive involvement was seen in the lateral hippocampal body in the right-MTS group as compared with the left.
Conclusions:
Deformation-based hippocampal shape analysis shows specific regions of hippocampal surface anatomy that are most affected in MTS. This technique may aid in detection of clinically significant anatomic abnormalities of the hippocampus in patients with epilepsy.
Insights
Deformation-based analysis reveals specific hippocampal shape changes in patients with mesial temporal sclerosis (MTS) and temporal lobe epilepsy (TLE). This method aids in detecting anatomical abnormalities in the hippocampus.
Area of Science:
- Neuroimaging
- Epilepsy Research
- Medical Image Analysis
Background:
- Mesial temporal sclerosis (MTS) is a common cause of temporal lobe epilepsy (TLE).
- Understanding hippocampal shape alterations is crucial for diagnosing and managing TLE.
- Traditional methods may not fully capture subtle anatomical changes.
Purpose of the Study:
- To evaluate hippocampal shape modifications in patients with MTS and TLE.
- To utilize deformation-based analysis for precise shape assessment.
- To identify specific patterns of hippocampal deformation associated with MTS.
Main Methods:
- Retrospective review of MRI scans from 30 subjects with unilateral MTS and TLE.
- Generation of average hippocampal models for right- and left-sided MTS groups.
- Coregistration of affected hippocampi to contralateral hippocampi to quantify shape differences using a color scale.
Main Results:
- Both right- and left-MTS groups exhibited inward deformation in the hippocampal head and tail.
- Maximal inward deformation occurred in medial and lateral aspects of the hippocampal head and tail.
- The right-MTS group showed more extensive lateral involvement in the hippocampal body compared to the left.
Conclusions:
- Deformation-based hippocampal shape analysis effectively identifies specific surface anatomy regions affected in MTS.
- This technique offers a valuable tool for detecting clinically significant hippocampal abnormalities in epilepsy patients.
- The findings contribute to a better understanding of the neuroanatomical basis of TLE associated with MTS.
