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

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Multi-component diffusion characterization of radiation-induced white matter damage.

Roshan A Karunamuni¹, Nathan S White², Carrie R McDonald³

¹Department of Radiation Medicine and Applied Sciences, University of California San Diego, 9500 Gilman Drive, La Jolla, California, 92093, USA.

Medical Physics

|February 22, 2017

Summary

Radiation therapy alters brain white matter microstructure. Multi-b-value diffusion models reveal dose-dependent increases in fast diffusion components and dose-independent decreases in slow diffusion components post-radiotherapy (RT).

Keywords:

biexponential diffusion MRI radiation white matter

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Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases

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Area of Science:

Neuroimaging
Radiotherapy Research
Diffusion MRI

Background:

Radiation therapy can induce significant changes in brain white matter.
Understanding the pathophysiology of radiation-induced tissue damage is crucial for patient management.

Purpose of the Study:

To characterize microstructural white matter changes following brain radiotherapy.
To differentiate fast and slow diffusion components using multi-b-value diffusion models.

Main Methods:

Retrospective analysis of 14 patients undergoing radiotherapy (RT).
Diffusion signal decay analyzed using a biexponential model to separate fast and slow diffusion components.
Linear mixed-effects models assessed the impact of radiation dose and time on diffusion parameters.

Main Results:

Fast diffusion coefficients increased with dose-time in both longitudinal and transverse directions.
Slow diffusion coefficients decreased over time (1, 4, 9 months) post-RT, independent of radiation dose.
Specific quantitative changes in diffusion coefficients were reported for fast and slow components.

Conclusions:

Radiation-induced white matter changes within the first year post-RT are characterized by distinct alterations in diffusion components.
Fast diffusion components show a dose-dependent increase.
Slow diffusion components exhibit a dose-independent decrease over time.