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Increased self-diffusion of brain water in normal aging

P Gideon¹, C Thomsen, O Henriksen

¹Danish Research Center of Magnetic Resonance, Hvidovre Hospital.

Journal of Magnetic Resonance Imaging : JMRI

|March 1, 1994

Summary

Brain diffusion imaging reveals that apparent diffusion coefficients (ADCs) in white matter significantly correlate with age in healthy adults. This finding is crucial for interpreting diffusion MR imaging in neurological disease research.

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Area of Science:

Neuroimaging
Biophysics

Background:

Magnetic resonance (MR) imaging is a powerful tool for non-invasively assessing tissue microstructure.
Water self-diffusion measurements provide insights into tissue properties, including white matter integrity.

Purpose of the Study:

To investigate the relationship between age and apparent diffusion coefficients (ADCs) in the white and gray matter of the healthy human brain.
To explore the potential causes of age-related changes in brain diffusion metrics.

Main Methods:

Diffusion magnetic resonance imaging was performed on 17 healthy volunteers aged 22-76 years.
Apparent diffusion coefficients (ADCs) were calculated for both cerebral white matter and cortical gray matter.

Main Results:

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A significant positive correlation was observed between white matter ADCs and participant age (r = .7069, P < .01).

ADC values in white matter ranged from 0.58 to 1.23 x 10(-9) m2/sec.

No significant correlation was found between gray matter ADCs and age, with values ranging from 1.06 to 1.72 x 10(-9) m2/sec.

Conclusions:

Age-dependent changes in white matter, potentially due to neuronal degeneration or altered myelination, influence water diffusion.
These findings highlight the necessity of age-matched controls in diffusion MR imaging studies for neurological conditions.