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Figure 14-14 Failed QAP results
13. The system prompts you if the QAP test has failed and indicates which portion was affected by dis-
playing messages. The following list provides information to correct the problem.
If the flat-field tests fail, check the collimator blade position and make sure they are fully open, i.e.
the collimator blades are not in the field of view.
If the MTF phantom test fails, a message appears (Figure 14-15).
Figure 14-15 QAP Phantom not found message
Check that the flat-field phantom is not in the collimator rail.
Check that the tube and detector are vertically aligned.
Check that the MTF phantom is inserted completely into the grid holder.
5495975-1EN Rev.9
© 2013-2017 General Electric Company. All rights reserved.
Chapter 14: Quality Assurance and Maintenance
14-12
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