AGFA Drystar AXYS Manual page 43

D AXYS
RYSTAR
Verifying Acceptable Spatial Resolution, Artifact
Levels and Low Contrast Visibility for general
radiography applications (DT 2 B and DT 2 C)
Procedure
1 Print the QC Test image or use the previously printed QC Test image used to
establish the daily operating density levels.
2 Visually check the QC test image for artifacts: no significant disturbing artifacts
should be visible.
3 Check the spatial resolution in each of the three circles (refer to item 1, 2 and 3
on the "QC test image for general radiography applications (DT 2 B and
DT 2 C)" on page 90). Within each circle there are three groups, 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.
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
(DT 2 B and DT 2 C)"
"QC test image for general radiography applications (DT 2 B and DT 2 C)"
page 90.
5 Record these values at the top of Chart 3 ('Drystar AXYS Artifacts and Spatial
Resolution Control Chart'). Refer to
96
WARNING: 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.
"QC test image for general radiography applications
on page 90 and the upper circle (refer to item 2 on the
"Quality Control Charts"
on
on page 149.
2852 A EN 20070205