LiveTrack AV for fMRI installation manual
Version R02
9
Installation
Filter box
The filter box includes a low pass filter that suppresses frequencies higher than 1 MHz with over
100 dB. This filter prevents damage and interferences caused by the high frequency signals of
the MR scanner. In addition, the filter box includes an optical isolation of the video signals. In
that way a full separation of the MRI equipment from the external power network is guaranteed.
The filter box should be screwed onto the penetration panel board by means of the feed through
camera connector.
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A 12 mm through hole in the penetration panel is required.
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The camera connector is guided through this hole from the control room side.
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The camera connector provides the ground connection to the shielding of the MR
cabinet. The penetration panel around the camera connector must therefore provide
good electrical contact. The area should therefore be free from paint or oxidisation and
the clamping nuts on the connector must be done up tight.
Power supply
The camera power supply should be connected to a suitable wall socket IN THE CONTROL
ROOM near to the penetration panel. DO NOT locate the power supply in magnet room. Plug the
low voltage DC lead from the power supply into the filter box (see below). The power for the
camera is then transmitted via the video cable. Next to the video connector is a green LED which
shines when the device is powered.
Livetrack
Connect the LiveTrack DSP box to the VIDEO OUT of the filter box with the video BNC lead.
The USB lead goes from LiveTrack to a spare USB socket on the host computer, but see the
section on setting up the host computer before attaching this lead.
Connect the trigger lead from LiveTrack to a TTL level trigger output from the stimulus
generator (use the trig out BNC if using a Cambridge Reseach Systems Visage or Bits# system.
Note: We recommend connecting the isolated scanner trigger to the stimulus generator, rather
than to LiveTrack, as this provides the lowest latency for control of the stimulus.
