SSRI-HEF-3D motion tracking system by Polhemus

Used to capture EEG net sensor locations when registering to MRI data. FASTRAK tracks the position (X, Y, and Z Cartesian coordinates) and orientation (azimuth, elevation, and roll) of a small sensor as it moves through space by using electro-magnetic fields to determine the position and orientation of a remote object.

Uses
Used to capture EEG net sensor locations when registering to MRI data

Specifications
Degrees-of-Freedom – 6 DOF
Number of Sensors – 1-4
Update rate - 120 Hz (divided by number of sensors)
Position Coverage – specified accuracy when standard receivers are located within 30 inches (76 cm.) of the standard transmitter.
Angular Coverage - all-attitude
Static Accuracy - 0.03” (0.08 cm) RMS for the X,Y,or Z receiver position, and 0.15° RMS for receiver orientation.
Resolution - 0.0002 inches/inch of range (0.0005 cms/cm of range), and .025°.
Latency - 4.0 milliseconds

Details
The FASTRAK tracking system from Polhemus uses electro-magnetic fields to determine the position and orientation of a remote object. The technology is based on generating near field, low frequency magnetic field vectors from a single assembly of three concentric, stationary antennas called a transmitter, and detecting the field vectors with a single assembly of three concentric, remote sensing antennas called a receiver. The sensed signals are input to a mathematical algorithm that computes the receiver’s position and orientation relative to the transmitter.