Source analysis and imaging

Source analysis and imaging

BESA has a highly interactive and easy-to-use window for source analysis. All relevant information is available at one glance including data, PCA, ICA, source waveforms, and source localization in 3D head schemes, standardized or individual MRI. You can choose among a variety of state-of-the-art source modeling techniques and head models. 2D and 3D source imaging can be performed with projection onto a standardized or individual MRI after coregistration.

Discrete multiple source analysis and Cortical CLARA image on inflated cortex

Source localization

• Highly interactive graphical user interface for fast hypothesis testing
• Spatio-temporal multiple dipole and regional source modeling
• Image-weighted source fitting
• Tomographic source sensitivity display
• Automated multiple source probe scan (MSPS) for model validation
• (MSPS) for model validation
• Automated source fitting: RAP-MUSIC, Genetic algorithm
• PCA analysis with generation of spatial source components
• ICA components obtained in the main window can be used as spatial components in the source analysis window

Cortical imaging

• Imaging solutions are truly computed on the individual or standard cortices, not projected!
• Cortical LORETA
• Cortical CLARA
• Minimum norm images based on the individual brain surface

Source imaging

• 3D imaging of oscillatory activity using the multiple source beamformer (MSBF) or Dynamical Imaging of Coherent Sources (DICS)
• Distributed volume images: LORETA, sLORETA, swLORETA, LAURA, SSLOFO
• Iterative, focusing 3D imaging by CLARA (Classical LORETA Analysis Recursively Applied)
• User-defined 3D imaging methods
• 3D movie of maps and dipoles using source waveforms
• Source activity projected onto standardized or individual MRI

Head model selection

• Individual FEM head models can be imported from BESA MRI
• Age-appropriate template head models for source analysis in infants, children, and adults (provided by John E. Richards, University of South Carolina, USA)
• Realistic standardized FEM and multi-shell ellipsoidal head models

Source import and export

• Direct transfer of source models between subjects and conditions
• Transfer of source models, waveforms, and 3D images to MATLAB
• Export of source models and source waveforms in ASCII
• Creation of source montages
• Coordinate systems: Talairach / Head / Device / Unit Sphere
• Batch commands for many source analysis functions