LiveTrack AV for fMRI

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Questions about LiveTrack AV for fMRI?

 

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.

PDF icon M0203 LiveTrack AV for fMRI Datasheet

Guide Price: £16500

SKU: M0203

Complete video eye tracking systems for fMRI

LiveTrack AV for fMRI

  • Ideal for monitoring fixation at 3T
  • Creates no scan artefacts from 1.5T up to 9.4T
  • Is available for monocular and binocular eye tracking
  • Offers real-time estimates of eye rotation, Direction of Gaze coordinates and pupil size
  • Has an extremely fast setup time - cameras with an integrated IR illumination source are mounted directly on the head coil close to the eye
  • Designed to work with BOLDscreen MR Safe LCD displays and rear-projection systems
  • Includes TTL-compatible trigger input port for data synchronisation
  • Features dedicated eye tracking hardware with USB output that makes integration with your software very easy. Works with Presentation, ePrime, MATLAB, Python and your own custom software
  • Streams real-time video feed that allows you to monitor the participant
  • Is compatible with Windows, Mac OS X and GNU/Linux

Very fast setup with robust tracking results from close-to-the eye imaging

Keeping the camera close to the eye makes it much easier to align and focus the image. Unlike other vendor's remote camera configurations, our approach provides fast setup and calibration, robust and reliable data with all participants. Simply point the LiveTrack AV camera at the eye, adjust the focus if needed and start recording.

Our MR Safe cameras have an integrated infrared 950nm illumination source. They give the best data when they are positioned behind a dielectric "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 950nm light through the mirror.

The participant sees the visible light image reflected from the cold mirror, and can therefore view a stimulus display placed outside the magnet bore. 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 participant's field of view, or compromising the range of eye rotations that can be tracked.

 

A full range of bespoke mounts are available and are highly recommended; they include a cold mirror so that the camera can be positioned completely outside the participant's field of view. This optical design makes the setup for each participant fast and repeatable and provides the optimum optical alignment for robust tracking.

Dedicated image processing

The self-contained LiveTrack AV signal processing unit 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 high-speed USB2 interface to the stimulus computer.

External trigger input

A separate TTL-compatible signal is recorded with the eye data for easy synchronisation with the stimulus, MR sequence, or any other external equipment.

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