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NFRA
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CAN Infrascanner Model 2000 Operator Manual
INFRASCAN, INC. VERSION 1 Page 20 of 41
4.2 The Infrascanner System.
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The Infrascanner includes a safe Class I NIR 808nm diode laser and a silicon detector.
The light to and from the laser and detector are optically coupled to the patient’s head
through two short disposable light guides. The light guides are long enough to reach
through hair and contact the scalp. The light guides are placed 4 cm apart allowing
optimal detection of hematomas. The detector light passes through an optical
bandpass filter centered at 808nm in order to minimize background light interference.
Electronic circuitry is included to control laser power and the detector signal amplifier
gain. The detector signal is digitized and analyzed by a Single Board Computer (SBC)
in the Infrascanner. The SBC receives the data from the detector and automatically
adjusts the settings of the Infrascanner to ensure good data quality. The data is
further processed by the SBC and the results are displayed on the screen.
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The Infrascanner is turned on by placing a Disposable Fiber Optic Shield on the
Infrascanner (see Figure 4-5) and turned off by removing the Disposable Fiber Optic
Shield. If the Disposable Fiber Optic Shield is not removed after approximately 8
minutes of inactivity, the Infrascanner goes into a sleep mode and starts’ beeping until
the Disposable Fiber Optic Shield is removed. Since the Infrascanner is still on, this will
drain the battery.
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When the Infrascanner is turned on and set to the Measurement screen, pressing and
releasing one of the Measure Buttons activates a measurement sequence at a given
head location. The measurement includes an initial adjustment phase and then the
data collection. The adjustment of laser power and detector signal gains is only done
at the first head location of a pair. The contra-lateral location uses the same
Infrascanner hardware parameters as the ipsi-lateral location. After a measurement
pair, the screen will display the differential optical density for that pair. The absolute
value of optical density is not relevant, just the relative difference between left and right
sides of the head.
Disposable Fiber
Optic shield
Screen
Software
Arrows and
Pins for Cradle
ON/OFF Micro Switch
Measure Buttons
Rubber Bumper
Rechargeable or Disposable
Batteries Compartment
Infrascanner Front Infrascanner Back
Figure 4-5: Model 2000 Infrascanner
Summary of Contents for 2000
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