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Advanced Diffusion Imaging in The Hippocampus of Rats with Mild Traumatic Brain Injury
Published on: August 14, 2019
The Role of MRI in Debunking the Fallacy of "Mild" Traumatic Brain Injury
Xingye Chen1,2,3, David Wright4, Sohae Chung1,2
1Center for Advanced Imaging Innovation and Research (CAI2R), Department of Radiology, New York University Grossman School of Medicine, New York, New York, USA.
Abstract:
Mild traumatic brain injury (mTBI) is a prevalent yet often overlooked public health concern due to the absence of detectable abnormalities on CT or conventional MRI scans. Approximately 18.3%-31.3% of mTBI patients experience persistent symptoms 3-6 months post-injury, despite normal imaging results, making diagnosis and treatment challenging. In recent years, advanced neuroimaging modalities have emerged with the potential to reveal subtle physiological and structural brain changes that are invisible to traditional imaging. Diffusion MRI (dMRI), for instance, is particularly valuable for detecting white matter injury; perfusion MRI assesses alterations in cerebral blood flow; sodium MRI (23Na MRI) provides insights into ionic homeostasis; and functional MRI (fMRI) detects disruptions in functional brain network connectivity. In this review, we first explore the underlying mechanisms of mTBI and then summarize current evidence supporting the use of advanced MRI techniques to detect injury signatures associated with these mechanisms. Finally, we highlight populations at heightened risk for repeated injuries-underscoring the urgent need for more sensitive diagnostic tools that can identify injury early, guide return-to-activity decisions, and prevent cumulative brain damage. EVIDENCE LEVEL: N/A. TECHNICAL EFFICACY: Stage 3.
Insights
Advanced MRI techniques can detect subtle brain injuries after mild traumatic brain injury (mTBI) that are missed by standard scans. These advanced methods are crucial for diagnosing persistent symptoms and preventing further brain damage.
Area of Science:
- Neuroscience
- Radiology
- Public Health
Background:
- Mild traumatic brain injury (mTBI) is a common condition often missed by CT and conventional MRI.
- A significant percentage of mTBI patients experience persistent symptoms despite normal initial imaging.
- This diagnostic gap complicates treatment and management of mTBI.
Purpose of the Study:
- To review the mechanisms of mTBI.
- To summarize advanced MRI techniques for detecting mTBI-related brain changes.
- To highlight at-risk populations and the need for improved diagnostics.
Main Methods:
- Review of current literature on mTBI mechanisms.
- Summary of advanced neuroimaging modalities: diffusion MRI (dMRI), perfusion MRI, sodium MRI (23Na MRI), and functional MRI (fMRI).
- Analysis of evidence for detecting subtle injury signatures.
Main Results:
- Advanced MRI techniques like dMRI, perfusion MRI, 23Na MRI, and fMRI can identify subtle physiological and structural brain changes post-mTBI.
- These methods offer potential for detecting injuries not visible with conventional imaging.
- Evidence supports their use in identifying injury signatures linked to mTBI mechanisms.
Conclusions:
- Advanced MRI techniques show promise for diagnosing mTBI and its persistent symptoms.
- These tools are essential for identifying individuals at risk of repeated injury.
- Sensitive diagnostic tools are needed for early injury detection, guiding return-to-activity, and preventing cumulative damage.
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