AGFA DRY 3.4 User Manual page 108

108 | DRY 3.4 | Advanced Operation (key-operator mode)
To identify artifacts and verify spatial resolution you must perform the
following test weekly or as needed for troubleshooting image quality
problems.
1. First, print out the QC mammography test image.
2. Check the test image visually for artifacts: no significant disturbing
artifacts should be visible.
3. Check the spatial resolution.
The test film also shows three squares which each contains an oval. These
3 ovals contain 3 groups, each having 5 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.
4. Check the Low Contrast Visibility at both the high (100 / 95%) and low
end
(0 / 5%) of the density scale. You should be able to see the circle in the
square (refer to item 1 on the 'QC mammography test image') and the
upper circle (refer to item 2 on the 'QC mammography test image').
5. Record these values on Chart 3 ('Artifacts and Spatial Resolution Control
Chart').
Related Links
Performing the daily QC test for mammography application
Establishing the image geometry reference values for mammography application
on page 103
Charts for mammography QC
Preventive maintenance schedule
Performing the Annual QC tests for mammography application
Geometric Consistency Test
To be able to notice fluctuations in image size and aspect ratio, you must
perform this procedure once a year.
1. First, perform the daily test.
2. Measure the distances A and B of the geometric square on the QC
mammography test image.
2602A EN 20191018 0826
WARNING:
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 printer can be used for any further
clinical imaging. If the problem can not be solved, call your
local service organization for assistance.
on page 135
on page 111
on page 106