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Constancy Test Quality Assurance
F.3-32 SOMATOM Spirit
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Performing the CTDI Air test
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With this test, you measure the dose in the system axis.
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After successful completion of the table position test the CTDI
Air test is started automatically without pressing the Start key.
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✓ The ionization chamber is centered in the axial direction in
the system axis. The slice plane has to run through the cen-
ter of the chamber. An appropriate dosimeter is connected
to the ionization chamber.
✓ The CTDI Air test mode is loaded.
✓ You are prompted to press Start.
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✧ Press the Start key on the control box.
Scanning is started.
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✧ Read off the value on the dosimeter and enter it in the pro-
tocol.
✧ Continue with the next kV values.
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