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Advanced Diffusion Imaging in The Hippocampus of Rats with Mild Traumatic Brain Injury
Published on: August 14, 2019
Role of diffusion-weighted magnetic resonance imaging in diffuse axonal injury
Y Ezaki1, K Tsutsumi, M Morikawa
1Department of Neurosurgery, Nagasaki University Graduate School of Medicine, Nagasaki, Japan. ezaki-nsu@umin.ac.jp
Purpose:
To determine whether the signal changes on magnetic resonance imaging (MRI), including fluid attenuated inversion recovery (FLAIR), T2*-weighted gradient echo (GE) imaging, and diffusion-weighted imaging (DWI) in diffuse axonal injury (DAI) patients correlate with the clinical outcome.
Material And Methods:
We diagnosed patients with DAI based on the following criteria: 1) a loss of consciousness from the time of injury that persisted beyond 6 h; 2) no apparent hemorrhagic contusion on computed tomography (CT); 3) the presence of white matter injury on MRI. Twenty-one DAI patients were analyzed (19 M, 2 F, mean age 34 years) with MRI (FLAIR, T2*-weighted GE imaging, and DWI).
Results:
325 abnormalities were detected by MRI within a week after injury. The T2*-weighted GE imaging was significantly more sensitive than FLAIR and DWI in diagnosing DAI. DWI detected only 32% of all lesions, but could depict additional shearing injuries not visible on either T2*-weighted GE imaging or FLAIR. The mean number of lesions in brainstem detected by DWI in the favorable group (good recovery/moderately disabled) was significantly smaller than in the unfavorable group (severely disabled/vegetative survival/death). This trend was not observed on the T2*-weighted GE imaging and FLAIR findings.
Conclusion:
DWI cannot detect all DAI-related lesions, but is a potentially useful imaging modality for both diagnosing and assessing patients with DAI.
Insights
Diffusion-weighted imaging (DWI) shows promise for assessing diffuse axonal injury (DAI) by detecting brainstem lesions that correlate with patient outcomes. While not detecting all DAI lesions, DWI aids in diagnosis and prognosis.
Area of Science:
- Neurology
- Radiology
- Medical Imaging
Background:
- Diffuse axonal injury (DAI) is a severe traumatic brain injury often diagnosed based on clinical presentation and CT scans.
- MRI techniques like FLAIR, T2*-weighted GE, and DWI offer detailed insights into white matter damage.
- Correlating imaging findings with clinical outcomes is crucial for prognosis and patient management.
Purpose of the Study:
- To evaluate the correlation between MRI signal changes in DAI patients and their clinical outcomes.
- To compare the sensitivity of FLAIR, T2*-weighted GE imaging, and DWI in diagnosing DAI.
- To determine the utility of DWI in assessing the severity and prognosis of DAI.
Main Methods:
- Twenty-one DAI patients meeting specific clinical and CT criteria underwent MRI, including FLAIR, T2*-weighted GE, and DWI.
- Abnormalities detected by MRI within one week post-injury were analyzed.
- The number of brainstem lesions detected by DWI was compared between favorable and unfavorable clinical outcome groups.
Main Results:
- T2*-weighted GE imaging demonstrated higher sensitivity in diagnosing DAI compared to FLAIR and DWI.
- DWI identified 32% of all lesions and revealed shearing injuries missed by other sequences.
- A significantly lower mean number of DWI-detected brainstem lesions was found in patients with favorable outcomes.
Conclusions:
- DWI is a valuable tool for diagnosing and assessing DAI, despite not detecting all DAI-related lesions.
- The number of brainstem lesions on DWI correlates with clinical outcomes in DAI patients.
- DWI offers unique insights into DAI pathology and prognosis.
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