Joint assessment of structural, perfusion, and diffusion MRI in Alzheimer's disease and frontotemporal dementia

Area of Science:

• Neuroimaging
• Neurology
• Radiology

Background:

• Alzheimer's disease (AD) and frontotemporal dementia (FTD) are distinct neurodegenerative conditions.
• Current MRI studies often analyze structural, perfusion, and diffusion abnormalities in isolation.
• Understanding cross-modal MRI relationships is crucial for differential diagnosis.

Purpose of the Study:

• To jointly assess gray matter (GM) and white matter (WM) abnormalities using multimodal MRI.
• To elucidate differences in abnormal MRI patterns between AD and FTD.
• To explore the potential of integrated MRI analysis for improved differential diagnosis.

Main Methods:

• Utilized 4 Tesla MRI for high-resolution imaging.
• Measured GM loss and hypoperfusion with T1-weighted and arterial spin labeling MRI (ASL-MRI).
• Quantified WM degradation using diffusion tensor imaging (DTI).
• Applied a novel analytical approach for joint assessment of multimodal data.

Main Results:

• FTD exhibited greater white matter (WM) degeneration than AD at mild abnormality stages.
• In FTD, gray matter (GM) loss and WM degeneration were more pronounced than perfusion deficits.
• In AD, structural and functional brain damage showed similar severity.
• Joint analysis revealed distinct patterns differentiating FTD and AD.

Conclusions:

• Multimodal MRI analysis provides a more comprehensive understanding of AD and FTD pathologies.
• Integrated assessment of GM, WM, and perfusion abnormalities can reveal disease-specific patterns.
• Joint MRI assessments hold promise as novel imaging biomarkers for differentiating FTD from AD.