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MRI and head modeling

MRI and head modeling

asa uses the latest technology available for rendering of pixelated images and 3D objects with optimal performance.

The MRI view allows the free rotation of slices cut through the MRI. It combines the display of MRI, segmentation of head compartments, inverse reconstructions (such as MUSIC, LORETA, cortical imaging and cortical ERD/ERS, and dipole fit results), and fMRI.

In addition, all objects usually shown in the 3D views (such as EEG/MEG maps, head models and sensors) can be added to the display.

Talairach Coordinate System and Transformations

asa allows to transform results obtained from an individual into a standardized coordinate system based on the Talairach definition. For this purpose, a set of anatomical landmarks is placed on the subject's MRI, based on which the transformation is carried out.

The transformed MRI (which is quite different from the individual MRI, since orientation and spacing between MR slices are newly defined and applied to create a new block of MRI) is then exported in to asa or Analyze (SPM) formats.

The same export can be applied to LORETA and MUSIC results in order to obtain results that can be further processed in a group statistics.

Segmentation of MRI and CT

The segmentation of the brain is used to create a head model for MEG reconstructions. In this figure, the brain rendering is shown in combination with the scalp segmentation (yellow regions) in 3D.
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