LiveTrack AV for fMRI installation manual
Version R02
7
Introduction
Overview
LiveTrack-AV for fMRI provides a 60Hz eye-tracking solution for experiments utilising an MRI
scanner. A miniature shielded video camera, with integrated 940nm NIR illumination source,
plus a bespoke mirror mount, enable eye-tracking without distracting from the visual stimuli.
The camera connects via a filter box that must be permanently installed in the penetration panel
of the magnet room. The filter box provides several vital functions: It prevents interference
coupling into the scanner. It prevents RF leakage from the scanner. It provides safety isolation of
the camera (EN60601 type B) from the computer equipment in the magnet room (which will
have higher leakage currents not permitted in the “patient environment”). Consult your
maintenance organisation for installation of the filter box in the penetration panel.
In the AV for fMRI version, there is one video camera and one or two DSP boxes per eye
(depending on the host operating system). So a full system would comprise two video cameras
and two or four DSP boxes.
The DSP box is located in the control room and connects to the host computer via a USB 2.0
connection. No power supply is needed for the DSP box, it receives its power from the host
computer via the USB connection.
The host computer is only used for stimulation, control and to receive results, the actual eye-
tracking is done by the DSP box.
