A new method to measure cortical growth in the developing brain.

Area of Science:

• Neuroscience
• Biophysics
• Developmental Biology

Background:

• Cerebral cortex folding is crucial for higher mammal brain development.
• The biomechanics and growth patterns during cortical folding are not fully understood.
• Cortical surface growth is known to be heterogeneous and anisotropic.

Purpose of the Study:

• To develop and apply a novel technique for measuring spatial and directional variations in cortical surface growth.
• To characterize the biomechanics of cortical folding using longitudinal MRI data.
• To illuminate the quantitative patterns of growth during brain development.

Main Methods:

• Developed a new surface registration algorithm using partial differential equations and finite element method.
• Applied the technique to longitudinal in vivo MRI data of ferret brains at different developmental stages.
• Validated the method with simulated test cases.

Main Results:

• Quantitative measurements of spatial, temporal, and directional variations in cortical growth were obtained.
• Deformation gradient and Lagrangian strain tensors were used to describe growth kinematics.
• The novel registration method successfully aligned cortical surfaces while minimizing deformation.

Conclusions:

• The developed MRI-based technique provides a powerful tool for studying brain development biomechanics.
• This method offers new insights into the complex processes of cortical folding.
• Quantitative characterization of growth patterns advances our understanding of neurodevelopment.