Geodesic Photogrammetry System (GPS) 2.0
When localizing sources of electrical activity in the brain, accuracy is everything. The Geodesic Photogrammetry System (GPS) allows you to increase the accuracy of source estimation, by determining the location of the EEG sensors on the scalp.
The GPS is an innovative photographic technology for sensor localization. The GPS 2.0 uses 11 cameras mounted in a geodesic array to photograph sensors on the patient’s head, allowing the simultaneous recording of all sensor positions. Patients are then free to go immediately.
At any time after photography, the location of the sensors can be determined by manually labeling the positions of the sensors in the photographs and then using a triangulation algorithm in the software to solve for the locations. The solved point cloud can be compared to the original pictures to verify accuracy.
The Geodesic Photogrammetry System has been shown to result in similar accuracy to that obtained with electromagnetic digitizers (Russell, Eriksen, Poolman, et al. (2005)). However, unlike electromagnetic digitizers, photogrammetry is not susceptible to electromagnetic interference, and therefore provides reliable data even in electrically noisy environments.
In addition, measurements with electromagnetic digitizers require a patient to remain still for the entire measurement, which can be difficult for some participants, particularly pediatric patients or patients with behavioral challenges. In contrast, the GPS 2.0 method can be used with any patient, as the measurement is complete within seconds.
Russell, Eriksen, Poolman, et al. (2005). Geodesic photogrammetry for localizing sensor positions in dense array EEG. Clinical Neurophysiology 116, 1130-1140.
The Geodesic Photogrammetry System includes:
Dense array EEG neuroimaging
Geodesic Photogrammetry System 2.0
Part of the Geodesic EEG Product Line
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