User Manual

54
2831A EN 20041201Advanced operation (key-operator mode)
DRYSTAR 5302 USER MANUAL
Verifying Acceptable Spatial Resolution, Artifact Levels and Low Contrast
Visibility
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 ovals. Within each oval there
are three groups, each having five dots. All five dots of each group must be
visible with a magnifying glass. The smallest cluster of 5 dots are only visible if
the viewing conditions are good.
4 Record these values at the top of the Drystar 5302 Chart 3 (Drystar 5302
Artifacts and Spatial Resolution Control Chart). Refer to ‘Quality Control Charts’
on page 75.
5 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 test image’ on page 52) and the upper circle (refer to
item 2 on the ‘QC test image’ on page 52).
6 These charts will be used for the weekly quality test. For more information,
refer to ‘Performing the Weekly QC tests’ on page 57.
Good viewing conditions are important for the correct interpretation of
both diagnostic and test images. Make sure that the lightbox 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.
In case of significant artifacts or insufficient spatial resolution, the reason
must be found and the problem solved before any further clinical films can
be printed.
Refer to ‘Preventive maintenance schedule’ on page 59 and ‘Maintaining image
quality and resolving image quality problems’ on page 173 of the Drystar 5302
Reference manual, or call your local Agfa service organization.