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Owandy Visteo – User manual
Page 28/30
6.2 Image quality
Symptom
Cause / Solution
The images are cut off, e.g.:
The sensor is badly positioned with regards to the X-ray
beam.
•
Reposition the sensor, making sure it is well within the
field of the X-ray beam.
•
Use the positioner provided with the sensor for optimal
positioning.
The images are too light or contain noise,
e.g.:
211 1
Film alike mode Auto contrast mode
•
The image is under-exposed, the X-ray dose is too low;
increase the X-ray dose on the generator. The
percentage that is displayed in the image indicate the
exposure level:
o
0 to 80% - under-exposed image
o
80 to 120% - correctly exposed image
o
120 to 200% - over-exposed image
•
Check the dose emitted by the X-ray generator, due to
age the dose can be insufficient. Have the generator
checked by a technician when in doubt.
•
The generator is positioned too far from the patient with
regard to the selected dose.
•
Check the parameters of your monitor (contrast and
brightness) and avoid reflections on the screen.
The images are too dark, e.g.:
•
The image is over-exposed, the X-ray dose is too high;
reduce the X-ray dose on the generator. The percentage
that is displayed in the image indicate the exposure
level:
o
0 to 80% - under-exposed image
o
80 to 120% - correctly exposed image
o
120 to 200% - over-exposed image
•
Check the parameters of your monitor (contrast and
brightness) and avoid reflections on the screen.
Grey levels seem to be missing in the
image (flat areas of grey appear).
•
Check the quality and parameters of the monitor.
•
Check the connection of the cable of the screen at the
side of the graphics card and the monitor.
•
Check the screen configuration under Windows (screen
configuration panel, it must display colours in at least
24bits.
The image is blurred.
Re-acquire the image:
•
The patient has moved during the exposure.
•
The generator head was not stabilised and has moved.
