Questions about LiveTrack AV?
LiveTrack AV for fMRI is an affordable video eye tracking system which provides real-time estimates of eye rotation, Direction of Gaze coordinates and pupil size. A live video stream from the eye tracking camera is available concurrently with the data so you can visually monitor and check your observer's behaviour throughout the experiment.
Note: the indicated Guide Price is for the monocular configuration and includes one opto-mechanical mount.
Guide Price: £16500
LiveTrack AV features:
Cold Mirror Infrared Optical System
MR safe cameras, with integrated infrared illumination sources, are positioned behind a large MR safe cold mirror. Cold mirrors are special optical components that are coated with a dichroic filter that reflects visible light while transmitting infrared wavelengths.
This allows the cameras to be optimally aligned in direct sight of the participant’s eyes, but at the same time hidden behind the mirror outside the participant’s view. The cameras can unobtrusively image each eye using infrared light through the mirror.
The participant sees the visible light image reflected from the cold mirror, and can therefore view a display placed outside the magnet. Our BOLDscreen MR Safe LCD displays are ideal for this purpose: they can be placed right at the opening of the bore, to give maximum field of view.
Shielded Copper Cable
The camera uses carefully shielded and filtered circuitry to isolate the video signal from the MR gradients and RF pulses.
Flexible Head Coil Clamps
A very flexible, articulated arm and plastic clamp that work with many birdcage/bar head coil designs is available. It is allows the camera to be sited in many locations, but often at the expense of being within the subject's field of view, or compromising the range of eye rotations that can be tracked.
A full range of bespoke mounts are also available and are highly recommended; they include a cold mirror so that the camera can be positioned completely outside the subject's field of view. This optical design makes the setup for each observer fast and repeatable and provides the optimum optical alignment for robust tracking.
Dedicated Image Processing
A self contained image processing computer analyses the video signal and identifies the pupil and corneal reflection. The video image stream, tracked eye position and pupil size data are all returned to the host computer across a USB interface.
External Trigger Input
A separate TTL-compatible signal is recorded with the eye data for easy synchronisation.