DOCUMENT NO. 920012 REV 2 EFFECTIVE 03-14-18 INFRASCAN CONFIDENTIAL PAGE 9 OF 35
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The Infrascanner Model 2000
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The Infrascanner Model 2000
Cradle
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An Infrascanner Model 2000
Disposable Shield
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The Infrascanner Model 2000
Transport Case
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The Infrascanner Model 2000
Operation Manual
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The USB Cable to connect the
Cradle
with a PC computer
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The Cradle Power Adapter, 5VDC
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Rechargeable Battery
A computer running Microsoft Windows
7, or later, is required to download the
Infrascanner’s data
Figure 1-2: Transport Case with system
components
2.0
THEORY OF OPERATION
2.1
BASIC NEAR INFRARED THEORY
All biological tissue is, to differing extent, permeable to electromagnetic (EM) radiation of
different frequencies and intensities. This can also be considered permeability to photons
of different energy levels. This permeability to EM energy is the basis of all imaging based
on transmission/scattering characteristics such as x-ray, Computed Tomography (CT), and
Near InfraRed (NIR) imaging. From the principles of spectroscopy, it is also known that
different molecules absorb different wavelengths of EM radiation (which is synonymously
referred to as light at smaller wavelengths). Similarly, tissue scatters EM radiation to
different degrees. The Infrascanner is concerned with NIR imaging of the hemoglobin
molecule.
From any light source, photons follow a characteristic path through the target tissue back
to a detector on the same approximate
plane as the source. While the light is
severely attenuated due to the scattering
and absorption process, it is nonetheless
encoded with the spectroscopic
signatures of the molecules encountered
en route to the detector. By carefully
choosing the wavelengths that are produced by the source, it is possible to detect the
relative concentration of hemoglobin in the target tissue. By comparing these levels to
tissue in a “baseline” state, and using
some basic knowledge about “interesting”
Figure 2-1: Simulated Photon Diffusion Path
