Two response pads

• The Lumina LP-400 system includes two fiber optic response pads, each with two coloured push buttons.
• Built of 100% plastic and fiber optic parts
• Magnetically and RF inert
• Water resistant
• Delivered with right hand and left hand versions
• Safe -- no laser lights are used
• The pads come permanently connected to a unit called the OTEC (see below) via a 3 m (15 ft.) fiber optic cable. This cable is protected by a sturdy crush resistant cover
• Pad dimensions:
  A: 7 cm (2.75)
  B: 2.4 cm (0.94")
  C: 12.55 cm (4.94")
  
  

OTEC

• The OTEC is the unit that converts the electrical signals to light. It is housed in an aluminum enclosure and is typically installed under the magnet.

Controller

• Powers the OTEC unit and detects input from the response pads
• Times the reaction time of the patient and provides other timing functions
• Accepts triggers from the MRI scanner via an optically isolated input
• Has lights with colors that match the push buttons to show when the patient has pressed a button
• Interacts with the host computer via the serial port
• Provides TTL input and output via the Accessory Connector.

The controller features a scanner trigger input. Physically, this is a BNC connector (75 ohm). The minimum width of a trigger pulse is 300 microseconds and there must be at least 25 milliseconds between pulses when in XID mode at 9600 baud. This can be 12 milliseconds for all other modes and baud rates.

In optical isolation mode, the minimum voltage for an 'ON' is 1.5V or higher, and 'OFF' is 1.3V or lower (measured with pin positive with respect to the aluminum enclosure).

Cables

• Two shielded cables are included, each about 21 m (65 ft.) long
• The first cable is installed inside the magnet room. It has a circular connector that plugs into the OTEC unit on one end, and a DB9 male connector that plugs into a DB9 cutout on the MRI room's penetration panel
• The second cable has a DB9 female connector that plugs into the penetration panel from outside the magnet room, and a circular connector that plugs into the controller
• A serial port cable
• A 9 volt A/C adapter
• Optionally, a filter for the penetration panel