A subject-specific framework for in vivo myeloarchitectonic analysis using high resolution quantitative MRI.

Area of Science:

• Neuroimaging
• Structural MRI
• Cortical Anatomy

Background:

• High-resolution structural magnetic resonance imaging (MRI) enables in vivo visualization of the cerebral cortex's laminar features.
• Studying cortical myeloarchitecture aids in mapping individual cortical areas.

Purpose of the Study:

• To present an integrated framework for analyzing intracortical structure using novel image processing tools.
• To establish a subject-specific intracortical coordinate system for detailed architectonic analyses.

Main Methods:

• Segmentation of quantitative T1 maps to delineate cortical boundaries.
• Utilizing an equivolume layering model to create an intracortical coordinate system aligned with anatomical layers.
• Evaluation using post mortem T2(∗)-weighted and in vivo T1-weighted MRI data.

Main Results:

• The proposed framework accurately delineates cortical layers and establishes a subject-specific coordinate system.
• Equivolume intracortical surfaces and transcortical profiles better represent laminar structure in curved cortical regions compared to existing methods.
• Demonstrated application in primary visual cortex (Brodmann area 17) and central sulcus regions (Brodmann areas 1, 3b, 4).

Conclusions:

• The developed framework provides a robust method for in vivo structural brain mapping at the individual level.
• This approach facilitates detailed analysis of cortical microstructure and its relationship with function.
• Represents a significant advancement for personalized neuroscience research.