AGFA CR 30-X Service Manual page 282

DD+DIS150.06E
(1) Put 2 cassettes underneath the FLFS cassette when using a FLFS cassette for
shading calibration.
Put a cassette underneath this area.
This prevents, that the missing
backscatter protection falsifies the
shading calibration result.
(2) Erase the two cassettes which were put underneath the FLFS cassette during
exposure.
(3) Observe IMPORTANT note below when evaluating the flatfield
(Evaluating the flatfield is described in section 3.1.1).
IMPORTANT:
When using a FLFS cassette for flatfield
exposure, the image will be slightly
darker in the upper and lower image
area where the backscatter protection is
removed (approximately 1 cm each).
These darker zones also have to be
used for image quality evaluation in
slow scan and fast scan direction to
verify a successful shading calibration.
The controlled version of this document resides on MedNet. Any printed copy of this document is uncontrolled.
Edition 1, Revision 3
10-2009
NOTE:
This covers the area where the cassette has no backscatter protection.
Only this area has to be covered, which is used by the digitizer to
determine the shading calibration curves.
FLFS cassette
Area used by
shading calibration
Figure 46: Exposure 1
DOCUMENT CONTROL NOTE:
Type 5175 / 100/110
Adjustments and Calibrations
Flatfield with
Genrad Cassette
CR 30-X
Repair and Service
Area used by
shading calibration
Figure 47: Exposure 2
Flatfield with
FLFS Cassette
Effect exaggerated
Figure 48
Chapter 3.6 / 34
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