How to display X-ray images
The black and white image - BW
The B/W image obtained with the scan represents the dif-
ferent objects of the baggage or freight item in different
brightness levels (grey levels) ranging from white to
black. The brightness corresponds to the current absorp-
tion characteristics of the scanned objects:
– objects of high absorption are represented in dark col-
or or black. These are either objects of higher density
(e.g. steel, lead) or objects of lower density but higher
thickness.
– objects of low absorption appear in bright color or
white. These are objects of lower density and thick-
ness (e.g. paper, textiles),
In an X-ray unit without separate b/w monitor, you ob-
tain the b/w image with
8 or a priority key assigned
to function BW.
The HI-MAT
PLUS
system* - the basic material detection*
Contrary to the b/w image, in addition to the different
brightness levels, the HI-MAT
PLUS
color image indicates
the material composition of the objects contained in the
scanned item by coloring with three different basic colors
and varying shades.
The materials an object is composed of are assigned to
three groups according to the effective atomic weight of
the chemical elements contained; the three groups are
represented in orange, green and blue. This assignment is
effected on the basis of a real time calculation from the
degrees of absorption measured depending on the radiation hardness.
The effective atomic number Z
eff
results from the atomic and molecular composition of the inspected materi-
als. If different materials are overlapping in a baggage or freight item, the effective atomic number Z
eff
res-
ults from the mean values of the involved atoms and molecules.
95587412 01/01/09 © Smiths Heimann
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The image display is improved by a real-time
sharpening filter.
1-61
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The image display will be improved by a
real-time sharpening filter.
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Materials which cannot be defined due
to very low or very high absorption, are
represented in white or black.
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