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Advanced Diffusion Imaging in The Hippocampus of Rats with Mild Traumatic Brain Injury
Published on: August 14, 2019
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Diffusion MRI abnormalities in adolescent rats given repeated mild traumatic brain injury
Ryan C Wortman1,2, Alicia Meconi1, Katie J Neale2
1Department of Neuroscience Central Clinical School Monash University Melbourne Victoria 3004 Australia.
Annals of Clinical and Translational Neurology
|December 20, 2018
Summary
Repeated mild traumatic brain injury (mTBI) in adolescent rats alters diffusion tensor imaging (DTI) and track-weighted imaging (TWI) measures. These findings support the use of advanced MRI techniques as biomarkers for mTBI.
Area of Science:
- Neuroscience
- Radiology
- Biomarker Discovery
Background:
- Adolescent mild traumatic brain injury (mTBI) poses significant health risks, with potential for long-term neurological damage.
- Objective biomarkers are crucial for managing mTBI, particularly following repeated injuries.
- Diffusion-weighted imaging (DWI) techniques like DTI and TWI show promise in detecting mTBI-related brain changes.
Purpose of the Study:
- To investigate the effects of repeated mTBI on DTI and TWI in adolescent rats.
- To evaluate the sensitivity of DTI and TWI to mTBI-induced alterations.
- To validate the Awake Closed Head Injury (ACHI) model for studying repeated mTBI.
Main Methods:
- Utilized the ACHI model to induce repeated mTBI in adolescent male and female rats.
- Administered four ACHI impacts over two days, starting on postnatal day 25.
- Analyzed brain tissue using DWI techniques, specifically DTI and TWI, at 1 and 7 days post-injury.
Main Results:
- Repeated mTBI led to significant changes in DTI metrics, including fractional anisotropy and radial diffusivity.
- Track density, a TWI measure, was also altered in rats subjected to repeated mTBI.
- These DWI changes were observed in both male and female adolescent rats.
Conclusions:
- Findings align with existing DTI studies in human mTBI patients.
- TWI may serve as a complementary DWI technique to DTI for mTBI assessment.
- DWI-derived measures show potential as objective biomarkers for mTBI.
- The ACHI rat model is further validated for investigating repeated mTBI.
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