| Visor MRI pre-processing and subject preparation |
The MRI of the individual subject is imported in DICOM, Analyze/Nifty or ASA format and further processed to extract the scalp and brain surfaces as well as anatomical landmarks for coordinate transformation. Alternatively, standard MRI can be used in case that no images of the subject are available. The subject is placed in a comfortable chair within a 3 meters distance from the camera. The navigation session starts by attaching a head band or EEG cap with the reference tool and measuring the subjects fiducial points using a pointer. The whole preparation procedure, including MRI import and image processing, is achieved in less than 15 minutes. |  |
Import of data Subject preparation starts with reading the MRI data. Data may be imported from DICOM, NIFTY/Analyze or ASA format. MRI segmentation and head modelling Visor provides a complete set of image-processing tools for scalp, skull and brain segmentation. Scalp and brain surfaces are generated from the segmented data and used during the TMS navigation procedure. | Curvilinear reformating The generated brain surface is the basis for the curvilinear surface. The curvilinear surface is used to visualize the activation of the TMS coil over the cortex. Coregistration and Talairach transformation MRI data from an individual may be transformed to a standardized coordinate system based on the Talairach system. This allows the definitation of TMS targets markers in Talairach space. |