64 09 713 D3610
D3610
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201.01.08
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02 09.2016
53
Sirona Dental Systems GmbH
5 Operation
Operating Instructions and Installation XIOS XG USB module and sensors
5.5 Select the exposure parameters for the X-ray tube
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5.5
Select the exposure parameters for the X-ray
tube assembly
5.5.1
X-ray doses and image quality
Factors for determining the X-ray doses
The dose to be set for X-ray exposure depends primarily on the following:
● Type of X-ray tube assembly (manufacturer, AC/DC, etc.)
● Distance between focal spot and sensor
● Morphology of patient
● Object, which tooth is to be X-rayed
The dose is adjusted through tube voltage and tube current (specified by
kV/mA) as well as exposure time.
Please refer to the operating instructions for the X-ray unit.
Effects of too low or too high a dose
For physical reasons the digital X-ray sensors behave in the same way as
with X-ray film. The lower the dosage value the higher the image noise,
which in turn generally leads to a poorer detail resolution.
Default setting for brightness and contrast
Default settings for brightness and contrast can always be optimally
adjusted through the image preprocessing function, independent of dose.
5.5.2
Recommended dose for XIOS XG sensors
XIOS XG sensors have a very wide effective dose area, so that,
depending on the object and diagnostic question at hand, the selection of
an optimal parameter adjustment is always possible.
Corresponding values apply to X-ray tube assemblies from other
manufacturers and to AC tube units. However, for optimal image quality
DC tube units should be used.
Please follow the manual for your intraoral X-ray tube assembly.
CAUTION
Image degradations caused by overexposure of the sensor cannot be
compensated using subsequent image processing!
IMPORTANT
Since the exposure time depends on the diagnostic problem as well as
the respective clinical situation, the selection of an optimal adjustment is
the responsibility of the treating physician.