Resting-state functional connectivity in the human brain revealed with diffuse optical tomography.

Area of Science:

• Neuroscience
• Biomedical Engineering
• Medical Imaging

Background:

• Resting-state network mapping is crucial for understanding brain function.
• Diffuse optical tomography (DOT) offers portable neuroimaging with simultaneous oxy- and deoxyhemoglobin measurement.
• Existing optical studies primarily focused on temporal features of brain signals.

Purpose of the Study:

• To develop and validate techniques for spatially mapping functional connectivity using DOT (fc-DOT).
• To demonstrate fc-DOT's capability in reproducing known functional neural architecture.
• To enable non-invasive brain mapping in populations difficult to study with fMRI.

Main Methods:

• Developed functional connectivity DOT (fc-DOT) techniques for spatial mapping.
• Performed simultaneous imaging over motor and visual cortices.
• Validated fc-DOT maps using task-response studies and subject-matched functional connectivity MRI (fc-MRI).

Main Results:

• Generated robust correlation maps of functional connectivity using fc-DOT.
• Confirmed the accurate localization of mapped networks against established neuroanatomy.
• Demonstrated fc-DOT's ability to reproduce expected functional neural architecture.

Conclusions:

• fc-DOT provides a novel, task-less approach for mapping brain functional connectivity.
• This technique expands neuroimaging possibilities for early development and unconscious patients.
• fc-DOT's hemoglobin contrast allows novel investigations into the biophysical origins of functional connectivity signals.