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Updated: May 31, 2026

Advanced Diffusion Imaging in The Hippocampus of Rats with Mild Traumatic Brain Injury

Advanced Diffusion Imaging in The Hippocampus of Rats with Mild Traumatic Brain Injury

Published on: August 14, 2019

White matter characterization with diffusional kurtosis imaging.

Els Fieremans¹, Jens H Jensen, Joseph A Helpern

¹Department of Radiology, New York University School of Medicine, New York, NY, USA. Els.Fieremans@nyumc.org

|June 25, 2011

Summary

This summary is machine-generated.

Diffusional kurtosis imaging (DKI) offers a new way to understand white matter health. This advanced MRI technique models tissue compartments to reveal details about axonal water fraction and extra-axonal space, aiding in neurodegenerative disorder assessment.

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Last Updated: May 31, 2026

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Published on: August 14, 2019

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Published on: April 7, 2015

Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases

Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases

Published on: July 28, 2013

Area of Science:

Neuroimaging
Biophysics
Magnetic Resonance Imaging

Background:

Diffusion tensor imaging (DTI) is a standard MRI technique.
Diffusional kurtosis imaging (DKI) extends DTI by probing restricted water diffusion.
Understanding DKI metrics in white matter requires robust biophysical models.

Purpose of the Study:

To provide a physically meaningful interpretation of DKI metrics in white matter.
To model white matter as intra-axonal and extra-axonal spaces.
To determine key microstructural parameters directly from DKI metrics.

Main Methods:

Modeling white matter as two non-exchanging compartments (intra- and extra-axonal).
Assuming anisotropic Gaussian diffusion characterized by diffusion tensors within each compartment.
Estimating DKI-derived parameters like axonal water fraction and tortuosity.

Main Results:

Model parameters were estimated from DKI metrics in healthy adults.
Estimated parameters were consistent with existing literature values.
DKI-derived axonal water fraction showed good agreement with biexponential fitting results.

Conclusions:

The proposed white matter model combined with DKI offers a convenient clinical assessment method.
This approach can provide valuable information for diagnosing neurodegenerative disorders.
DKI enhances the clinical utility of MRI for evaluating white matter integrity.