User Manual

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2900H EN 20071108Advanced operation (Key-operator mode)
DRYSTAR 5500/5503 REFERENCE MANUAL
Establishing the reference values and verifying image quality for
general radiography applications (DT 2 B and DT 2 C)
After installation of a new Drystar 5500 and before initial use you must
establish Quality Control aim values. These values will be used as the base
line for comparison when daily Quality Control is done. These values should
be determined again after major service, repair or software update.
The following Quality Control aim values must be determined:
• The daily operating density levels. Refer to ‘Establishing the daily operating
reference density levels for general radiography applications (DT 2 B and
DT 2 C)’ on page 143.
• Drystar 5500 image geometry. Refer to ‘Establishing the image geometry
reference values for general radiography applications (DT 2 B and DT 2 C)’ on
page 146.
Once Quality Control aim values are established you must evaluate the
Spatial Resolution, the Artifact Levels and the Low Contrast Visibility to
determine if the image quality is acceptable. Refer to ‘Verifying Acceptable
Spatial Resolution, Artifact Levels and Low Contrast Visibility for general
radiography applications (DT 2 B and DT 2 C)’ on page 148.
The Quality Control aim values, the Spatial Resolution and Artifact Levels and
the Image Geometry values are all recorded on the Quality Control charts.
Refer to ‘Charts for general radiography QC’ on page 242.
On these charts, the following test conditions are also recorded:
• The type and serial number of the Drystar 5500.
• The type and emulsion number of the film used to determine the reference
values.
• The type of densitometer used.
• The time (day, month, year) that the values were established.
Before you can establish the daily operating levels, the Drystar 5500 must
be switched on for at least 15 minutes and it must be calibrated as well.
Refer to ‘Switching on the Drystar 5500’ on page 34 and ‘Performing the
calibration procedures’ on page 111.