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The screen
properties
decisive for image quality, such as intensification factor, resolving power
and contrast depend to such a large extent upon the object and the quality
of the radiation, that we dispense with accurate curve displays and data.
Filtration (prefiltering and patient absorption) of the different wavelengths,
different film densities, scatter etc. can change such values so decisivaly
that accurate numercial data on screens for comparisons in exposure are
possible with great difficulty and usually have little significance in practice.
(CaWO4) blue
Phosphor used:
microcristalline calcium tungstate. Spectral position of the emitted screen
light at the maximum at approx. 400 nm.
The requirements of radiation protection for dose reduction in
X-ray exposures – without loss of definition – led to further
developments on the screen sector:
SPECIAL (200) blue (high-speed)
The sensitivity of the Special screen – depending upon voltage and
object exposed – is almost double as high as that of a customary Universal
screen.
UNIVERSAL (200) blue
This screen combines relatively high sensitivity (reducing kinetic blurring
and dose) with excellent detail perceptibility. It is suitable for all unit
types and types of exposure.
LGY
(Rare-earths basis) blue
X-ray intensifying screens on rare-earths basis for blue-sensitive
films.
Intensifying screens with fluorescent substances of high light yield
on rare-earths basis (yttrium oxisulfide with terbium) have found
broad application.
Our Dr. Goos LGY screens, which can be used with all customary X-ray
films in a conventional manner, are based on a phoshor with light
emission adapted to blue-sensitive films.
LGY-HIGH-SPEED (400) blue
Very highly intensifying type.
Relative intensification 4 compared with Universal (CaWo4).
Good definition.
LGY-medium (200) blue
Medium sensitivity.
Relative intensification 2
(corresponding to Special screen).
Higher definition.
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LGG
(Rare-earths basis) green
X-ray intensifying screens on
rare-earths basis for green-
sensitive films.
This screen type based on
gadolinium oxisulfide is effective only in the green spectral range
around 550 nm. Very low graininess, therefore good definition.
LGG-HIGH-SPEED (400) green
Very highly intensifying type.
Relative intensification 4.
Good definition.
LGG-MEDIUM (200) green
Medium sensitivity.
Relative intensification 2.
Higher definition.
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On request, even higher sensitivity classes
(e. g. 600, 800) can be manufactured. |
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| Sensitivity (grafic) |
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General data
Our scientific and practical experience extending over decades in
the field of fluorescent substances, the manufacture of intensifying
screens and their use in radiography guarantee you the highest degree
of definition and intensification, reliable uniformity and stability
adapted to the application in hand. All advances in the field of intensifying
screens have been incorporated in our intensifying screens proven
for approx. 40 years in the entire world – to your adavantage.
Put your trust in our experience! |
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