Diffusion Kurtosis Imaging Detects Microstructural Changes in the Brain after Acute Alcohol Intoxication in Rats

Area of Science:

• Neuroimaging
• Biomedical Engineering
• Radiology

Background:

• Acute alcohol intoxication causes complex brain alterations.
• Conventional diffusion tensor imaging (DTI) may not fully capture these dynamic changes.
• Diffusion kurtosis imaging (DKI) offers a more sensitive approach to probing microstructural brain changes.

Purpose of the Study:

• To evaluate the technical feasibility of DKI in assessing brain changes following acute alcohol intoxication.
• To compare DKI-derived metrics with DTI parameters in response to alcohol intake.
• To determine if DKI can detect pathophysiological alterations missed by DTI.

Main Methods:

• High-field (7.0T) MRI scans were performed on participants before and at 30 minutes, 2 hours, and 6 hours after alcohol administration.
• Diffusion tensor imaging (DTI) and diffusion kurtosis imaging (DKI) were applied to the frontal lobe and thalamus.
• Key metrics analyzed included mean kurtosis, mean diffusivity, and fractional anisotropy.

Main Results:

• Mean kurtosis significantly decreased within 30 minutes post-intoxication, followed by a gradual increase over 6 hours.
• Mean diffusivity showed significant decreases in both frontal lobe and thalamus at various time points.
• Fractional anisotropy decreased only in the frontal lobe, while the thalamus showed no significant change.

Conclusions:

• Diffusion kurtosis imaging (DKI) is technically feasible and sensitive for monitoring acute alcohol intoxication effects on the brain.
• DKI provides complementary information to DTI, revealing dynamic microstructural changes in brain regions like the frontal lobe and thalamus.
• DKI holds promise for a more comprehensive understanding of alcohol-induced neurotoxicity and recovery.