Association between cognitive function and relaxation rates of the cerebral cortex

Area of Science:

• Neuroimaging
• Cognitive Neuroscience
• Geriatrics

Background:

• Early detection of cognitive decline is crucial for timely intervention.
• Cerebral cortex relaxation rates, measured by R1 and R2, may reflect underlying neuropathological changes.
• Understanding the relationship between these rates and cognitive function is essential.

Purpose of the Study:

• To investigate the correlation between cognitive function and cerebral cortex relaxation rates in elderly individuals.
• To identify potential imaging biomarkers for early cognitive decline.

Main Methods:

• Brain MRI was conducted on 97 elderly participants (65-84 years).
• Synthetic MRI (SyMRI) generated R1 and R2 maps.
• Cognitive function was assessed using the Montreal Cognitive Assessment (MoCA).
• Voxel-based quantification (VBQ) and morphometry (VBM) analyses were performed.

Main Results:

• A significant negative correlation was found between R1 values and MoCA visuospatial/executive scores in specific frontal regions.
• No significant correlations were observed between R2 values and cognitive scores.
• No significant group differences were detected between mild cognitive impairment and healthy control groups via VBQ or VBM.

Conclusions:

• Visuospatial/executive function impairment in early cognitive decline is associated with higher R1 and R2 values in the frontal cortex.
• These relaxation rates show potential as imaging biomarkers for detecting early-stage cognitive decline.