Lumina LP-400 Specifications

The Lumina LP-400 system has several components (see How It Works). Here is a list of all the components that come with the system along with detailed information about the individual components.

  Response Pads

The Lumina LP-400 system includes two fiber optic response pads, each with two colored push buttons. They are:

• 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. The dimensions of the pads are as follows: Side A:  7 cm (2.75) Side B:  2.4 cm (0.94") Side 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.

The picture above on the left shows the OTEC unit connected to the two response pads via the protected fiber optic cable. The picture on the right shows more details of the OTEC unit.

  Controller

The controller is where everything connects. The 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 (see below). 

• 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.

See also Controller Features for detailed information about the controller's software capabilities.

  Controller's Trigger Input

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 trigger is guaranteed to be 'OFF' when the voltage is 1.1V or less, and 'ON' when the voltage is 1.5V or higher with an input current of 2mA.  The input must be positive with respect to the enclosure's ground.

When not using the optical isolation, the trigger is guaranteed to be 'OFF' when the voltage is below 1.0V, and 'ON' when the voltage is 1.5V or higher with an input current of 2mA.

  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.

  Other Components

The Lumina system comes with the following additional components:

• A filter for the penetration panel. This item is not normally included but is provided free of charge upon request. It is needed only if your penetration panel is not filtered already.

• A 9 volt A/C adapter.

• A serial port cable.