Setting The X-Ray Parameters Manually - Siemens ARCADIS Varic Operator's Manual

Automatic dose rate
control
Activating ADR stop
Setting the X-ray
parameters manually
ARCADIS Varic
SPR2-310.620.30.02.02

Setting the X-ray parameters manually

The default X-ray parameters can be changed manually with the +/- keys for kV/mA.
Using automatic dose rate control (ADR), the mean value of the image gray val-
ues is kept constant within the dominant largely independently of the object
transparency and position. This ensures optimal image quality for on-screen eval-
uation.
( Register 9: Technical Data, Page 4)
Three factory default settings for the dose rate are set: reduced dose, standard
dose, increased dose (for 23 cm/9" I.I. (0.11/0.185/0.37 µGy/s).
When metallic objects (e.g. intermedullary nails) are introduced into the beam
path or when examining objects of varying density (e.g. hip prosthesis) under flu-
oroscopy, it is recommended that you set the kV just established with the
Dose Rate Control Stop key at the start of fluoroscopy.
Press this key.
– The stop function is switched on, the LED lights up.
– Automatic dose control is disabled.
– The +/- keys for kV/mA are enabled.
You can set the kV/mA values manually by activating the Dose Rate Control
Stop key.
Press the +/- keys briefly.
– The kV/mA values are increased/reduced.
– The set values are displayed.
or
Keep the +/- keys pressed for a period of time.
– This results in a continuous increase/decrease of the particular X-ray param-
eters.
Once the upper or lower limit of the setting range is reached, an acoustic signal
is emitted every time you press the key again.
The mA values assigned to the kV values result from the SIREMATIC curves.
( Register 9: Technical Data, Page 3)
On reaching the end of the curve, the iris diaphragm is opened. The LED flashes.
If the iris diaphragm is opened to maximum, an acoustic signal sounds.
System Description
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