AGFA Drystar 5302 Reference Manual page 135

Performing the Weekly QC tests
Spatial Resolution, Artifact Test and Low Contrast Visibility
To identify artifacts and verify spatial resolution you must perform the
following test weekly or as needed for troubleshooting image quality
problems.
Good viewing conditions are important for the correct interpretation of
both diagnostic and test images. Make sure that the light box intensity
(luminance) is between 2000 and 4000 cd/m² (4500 and 6500 °K). Use a
magnifying glass and use shutters to collimate. Make sure the ambient
light is low.
First, print out the QC test image. Refer to
1
page 133.
Check the QC test image visually for artifacts: no significant disturbing artifacts
2
should be visible.
Check the spatial resolution in each of the three circles (refer to item 1, 2 and 3
3
on the 'QC test image'
each consisting of five dots. All five dots of each group must be visible with a
magnifying glass. The smallest cluster of 5 dots is only visible if the viewing
conditions are good.
Check the Low Contrast Visibility at both the high (100 / 95%) and low end
4
(0 / 5%) of the density scale. You should be able to see the circle in the square
(refer to item 1 on the
item 2 on the 'QC test image'
Record these values on Chart 3 ('Drystar 5302 Artifacts and Spatial Resolution
5
Control Chart').
In case of significant artifacts, insufficient spatial resolution or failure of
any other recommended QC tests, the cause of the problem must be
identified, and corrective action must be taken before the Drystar 5302
can be used for any further clinical imaging.
Refer to
quality and resolving image quality problems'
Agfa service organization for assistance.
2830A EN 20050526
on page 126). Within each circle there are three groups,
'QC test image'
on page 126).
'Preventive maintenance schedule'
'Performing the daily QC test'
on page 126) and the upper circle (refer to
on page 172
on page 194, or call your local
Advanced operation (Key-operator mode)
D 5302 R
RYSTAR EFERENCE MANUAL
on
and 'Maintaining image
135