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Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging
Published on: November 8, 2012
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Reliability and variability of diffusion tensor imaging (DTI) tractography in pediatric epilepsy
Helen L Carlson1, Christianne Laliberté2, Brian L Brooks3
1Alberta Children's Hospital, 2888 Shaganappi Tr NW, Calgary, AB T3B 6A8, Canada; Alberta Children's Hospital Research Institute (ACHRI), Room 293, Heritage Medical Research Building, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada.
Epilepsy & Behavior : E&B
|July 12, 2014
Summary
Diffusion tensor imaging tractography reliably assesses white matter integrity in children with epilepsy. Diffusion variables are more reliable than tract volume for evaluating white matter damage.
Area of Science:
- Neuroimaging
- White Matter Integrity
- Pediatric Epilepsy
Background:
- Diffusion tensor imaging (DTI) tractography aids in mapping white matter (WM) pathways and assessing microstructural integrity.
- Tractography's subjectivity and reliability in pediatric epilepsy populations remain under-investigated.
- Assessing WM damage in children with epilepsy using tractography presents unique challenges due to potential anatomical variations.
Purpose of the Study:
- To evaluate the variability and reliability of DTI tractography for assessing white matter integrity in children with epilepsy.
- To compare the reliability of diffusion variables versus tract volume measurements in this clinical population.
Main Methods:
- DTI data acquired from 43 children with epilepsy (mean age 11.7 years).
- Tractography performed twice for six WM tracts by two experienced tractographers.
- Variability (CV) and reliability (ICC) calculated for tract volume and diffusion variables (FA, MD, AD, RD).
Main Results:
- Diffusion variables demonstrated low variability (CV: 2.7-8.8%) and high reliability (ICC: .97-.99), except for limbic tracts.
- Tract volume measurements exhibited high variability (CV: 21.9-62.0%) and moderate reliability (ICC: .54-.99).
- Limbic structures showed greater variability compared to other WM tracts.
Conclusions:
- DTI tractography and diffusion variables offer a reliable method for assessing WM integrity in pediatric epilepsy.
- Reporting reliability metrics is crucial for clinical studies investigating WM integrity.
- Diffusion characteristics are more robust than tract volume for evaluating WM integrity in this cohort.
