Possible Reasons For A Failed Shading Calibration; Appendix: Changes In The Shading Calibration Procedure If Full Leg / Full Spine Cassettes Are In Use - AGFA CR 30-X Service Manual

DD+DIS150.06E
3.1.2

Possible Reasons for a failed Shading Calibration

There are mainly following reasons for a failed shading calibration:

Dirt or dust in the optical path

Cassette wrong exposed (too high / low dose)

Cassette not exposed on its full surface (wrong collimation)

PMT exposed to direct sunlight before calibration (in this case PMT has lower
sensitivity)

PMI board carrier (with mounted PMT) misaligned
3.1.3 Appendix: Changes in the Shading Calibration Procedure if Full Leg / Full Spine
Cassettes are in Use
NOTE:
This section describes the changes in the shading calibration procedure, if a FLFS
cassette is used. See section 3.1.
Reason for different proceeding: In opposite to Genrad (General Radiology)
cassettes, FLFS cassettes do not have the complete IP area covered with a
backscatter protection: The lead foil does not cover approximately 10 mm on the
upper and lower side of the cassette.
The controlled version of this document resides on MedNet. Any printed copy of this document is uncontrolled.
Edition 1, Revision 3
10-2009
Genrad Cassette
Backscatter
Protection
DOCUMENT CONTROL NOTE:
CR 30-X
Type 5175 / 100/110
Repair and Service
Adjustments and Calibrations
FLFS Cassette
FLFS
Figure 45
Agfa Company Confidential
FLFS
10 mm
10 mm
Chapter 3.6 / 33