| 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. |
Optical Precison Measurement The xensor electrode digitizer system is based on the NDI Vicra system. This position sensor hardware uses infrared light to track tools (like a digitizer pen or head tracker). Each tool is equipped with multiple markers. The stray markers reflect infrared light back to the position sensor and from this the 6D position is retrieved (position and orientation). | ||
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