 Fast, accurate 3D position measurement
and motion tracking
The
Fastrak 3D Digitizer is the
most accurate electromagnetic tracking system available,
and it is the perfect solution for localization of electrodes and body landmarks
in preparation for the coregistration of surface measured potentials with anatomical/functional
images in
EMSE Suite or
BESA. Fastrak is controlled by the
Locator software, which acquires
and displays 3D position measurements for electrodes, fiducial landmarks and
other points on the body surface. |
Fastrak uses patented
low-frequency magnetic transducing technology, so there's no need to worry about
maintaining a clear line-of-sight between receiver and transmitter.
This powerful technology eliminates the problem of signal blocking and
interference that distorts sonic and laser devices.
Best of all, Fastrak, coupled with the Locator software, is a
very fast way to measure electrode positions. Consider this --
your total time commitment for electrode position measurement is
approximately 2 seconds per electrode (roughly 2 minutes for 64
channels or 4 1/2 minutes for 128 channels.
Consider these benefits:
-
Adds only a few minutes to a study.
-
Electrode coordinates are compatible
with almost all research EEG analysis programs, including BESA, EMSE
Suite, Analyzer and those made by competitors.
-
Resolution of 0.0002 inches per inch of
transmitter and receiver separation;
0.025 degrees orientation. Static
accuracy of 0.03" RMS for the X, Y, or Z
position;
0.15 degrees RMS for receiver orientation.
Components
The Fastrak 3D Digitizer
as provided by Cortech Solutions includes a System Electronics Unit (SEU), a
power supply, three cube receivers, one stylus and one standard transmitter.
- System Electronics Unit:
Contains the hardware and software necessary to generate and sense the
magnetic fields, compute position and orientation, and interface with the host
computer via an RS-232.
- Transmitter: The transmitter
is a triad of electromagnetic coils, enclosed in a plastic shell, that emits
the magnetic fields. The transmitter is the system's reference frame for
receiver measurements.
- Receiver: The receiver is a
small triad of electromagnetic coils, enclosed in a plastic shell, that
detects the magnetic fields emitted by the transmitter. The receiver is a
lightweight cube whose position and orientation are precisely measured as it
is moved. The receiver is completely passive and highly reliable.
- Stylus: The stylus is a
pencil-like device that contains a triad of electromagnetic coils, and is used
for digitizing electrode locations and collecting the contours of a subject's
head. We provide the system with the stylus in an 8" length, with a
round nib.
Features
- Real Time: Virtually no
latency. Digital Signal Processing (DSP) technology provides 4ms latency
updated at 120 Hz. And data is transmitted to the host at up to 100K
bytes/sec.
- Improved Accuracy and
Resolution: Accuracy of 0.03" RMS with a resolution of 0.0002 in./in. makes
this the most precise device of its kind.
- Range: Standard range is up
to 10 feet. Coverage of up to 30 feet is possible with the optional LONG
RANGER transmitter.
- Multiple Receiver Operation:
Permits measurement of up to 4 receivers on a single system and up to 16
receivers at a time, utilizing four multiplexed systems.
- Reliable: From the pioneer in
3D position/orientation measuring devices, in business since 1970. Factory
calibrated, never needs adjustment.
- Multiple Output Formats:
Position in Cartesian coordinates (inches or centimeters); orientation in
direction cosines, Euler angles or Quaternions.
Copyright
© Polhemus, Inc.
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