Diffuse optical cortical mapping using the boundary element method.

Area of Science:

• Medical imaging
• Neuroscience
• Biophysics

Background:

• Cortical mapping, or optical topography, is an emerging non-invasive medical imaging technique.
• Current methods often oversimplify subject geometry, limiting accuracy.
• Accurate localization of brain activity in the cortex is crucial for understanding neurological function.

Purpose of the Study:

• To develop and demonstrate a method for localizing activated brain regions using an anatomically accurate model.
• To improve the precision of optical topography by incorporating realistic subject geometry.
• To validate the technique through simulation and in vivo experiments.

Main Methods:

• Utilized a Boundary Element Method (BEM) for the forward model in diffuse optical imaging.
• Reconstructed perturbations in the absorption coefficient within a geometrically realistic brain model.
• Performed in vivo experiments to validate the simulation results.

Main Results:

• Successfully demonstrated the reconstruction of absorption coefficient perturbations in a realistic simulation.
• Validated the technique with in vivo data, showing its applicability to human subjects.
• Achieved reliable activity maps by integrating anatomical data into the imaging process.

Conclusions:

• Diffuse optical imaging of the head can provide reliable brain activity maps when using anatomically accurate models.
• Incorporating realistic geometry significantly enhances the precision of cortical mapping.
• This approach advances the non-invasive investigation of the brain's outer cortical layers.