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Rev 5.39 - 29/03/12
xensor- 3D electrode digitizer system
xensor provides a new approach to 3d electrode digitization for clinical and cognitive research. The electrode digitizer system uses a very accurate technique based on infrared light to track tools (like a digitizer pen or head tracker). The system takes care of the electrode digitization procedure and records, visualizes and stores the digitized electrode positions. The sequence of the digitization procedure is pre-defined by the user. Positions are acquired by locating the respective electrode at the scalp, placing the digitizer pen at that location and pressing a button. Markers (nasion, left and right pre-auricular points) are digitized as well. This way, the electrode positions are transformed to the nasion-ear coordinate frame.
During the procedure a head tracker monitors the movement of the subject and compensates the acquired positions for these movements. The system provides real-time feedback on the current location of the digitizer pen and acquired electrode position by displaying them in the MRI and head surface. Digitized electrode positions are immediately marked on the head surface and can be visualized in the MRI for inspection.
xensor features & benefits
- Optical precision measurement
- Insensitive for head movements
- Real time tracking
- Individual registration using fiducial markers
- Head shape point generation to achieve highest accuracy
- Xensor supports the following MRI formats: DICOM, Analyze, SPM, Nifty, ASA, Neuromag
Technical specifications of Xensor system
- Infrared camera system, providing real-time tracking of multiple tools
- Digitizer pen for digitization of electrode positions (no cables)
- Head tracker to compensate for any head movements
- Online MRI/3D display: visualization of MRI/CT and head surfaces
- Real-time tracking of digitizer pen in MRI
- The display of the MRI slices is adjusted automatically to show the point of navigation (digitizer pen)
- The configuration can be viewed from any location, freely rotated and zoomed in while navigating.
- Export of digitized electrode positions to ASCII or ASA format
- Accurate and reliable: the system provides real-time feedback on the current location of the digitizer pen on the MRI and head surface.
- Digitized electrode position are immediately marked on the head surface and visualized in the MRI for inspection.
- Automatic logging of electrodes and TMS coils positions for reporting
