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Agfa Gevaert N V 5364A Manual Do Utilizador

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2900H EN 20071108
Advanced operation (Key-operator mode)
D
RYSTAR
 5500/5503 R
EFERENCE
 
MANUAL
Verifying Acceptable Spatial Resolution, Artifact Levels and Low Contrast
Visibility for general radiography applications (DT 2 B and DT 2 C)
To verify acceptable spatial resolution, artifact levels and low contrast 
visibility, proceed as follows:
1
Print the QC general radiography test image or use the previously printed QC 
general radiography test image used to establish the daily operating density 
levels.
2
Visually check the QC general radiography 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 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 
 on page
) and the 
upper circle (refer to item 2 on the 
 on 
page
).
5
Record these values at the top of Chart 3 (‘Drystar 5500/5503 Artifacts and 
Spatial Resolution Control Chart’). Refer to 
on page
.
6
These charts will be used for the weekly quality test. For more information, 
refer to 
 on page
.
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) for 
general radiography. 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 cause 
must be found and the problem solved before any further clinical films can 
be printed.
Refer to 
page
local Agfa service organization.