Structural brain imaging as a diagnostic tool in dementia, why and how?

Area of Science:

• Neurology
• Radiology
• Gerontology

Background:

• Increasing global aging populations drive a rise in cognitive failure and dementia diagnoses.
• Brain structural imaging is crucial for dementia assessment, with Computed Tomography (CT) and Magnetic Resonance Imaging (MRI) being primary methods.
• The growing demand necessitates cost-effective diagnostic approaches.

Purpose of the Study:

• To compare the utility and cost-effectiveness of CT versus MRI for initial investigation of cognitive failure and suspected dementia.
• To evaluate the diagnostic capabilities of each imaging modality in identifying secondary causes and aiding differential diagnosis.

Main Methods:

• Comparative analysis of Computed Tomography (CT) and Magnetic Resonance Imaging (MRI) for brain imaging in dementia assessment.
• Evaluation of cost-effectiveness, radiation exposure, and diagnostic accuracy of both CT and MRI.
• Assessment of imaging quality for specific pathologies, including cerebrovascular lesions and skull base structures.

Main Results:

• CT is significantly more cost-effective than MRI but involves patient radiation exposure.
• MRI offers superior visualization of cerebrovascular lesions and skull base anatomy compared to CT.
• The difference in overall diagnostic accuracy between CT and MRI is marginal.

Conclusions:

• The marginal diagnostic advantage of MRI over CT in dementia assessment may not justify its substantially higher cost.
• CT presents a more cost-effective initial imaging choice, despite its radiation exposure.
• Further research is needed to definitively determine the optimal first-line imaging strategy based on specific clinical contexts and cost-benefit analyses.