Siemens MAMMOMAT Novation DR, Installation Manual, Page: 43 / 104

X-ray tube checks 6 - 5
Siemens AG SPB7-250.815.02 Page 5 of 6 MAMMOMAT Novation
DR
Medical Solutions Rev. 02 09.04 CS SD 24 System
Checks with a large focus and with AEC
6
Prerequisites
•
Remove the lead apron from the detector.
•
Mount the collimator mounted plexi phantom.
•
Register a patient.
•
Make sure the magnification table is removed, so that a large focus is selected.
•
Select H on the control console, the MAMMOMAT is in now in AEC mode.
•
The check has to be performed for each measurement of the table.
Test performance
1. Adjust the exposure value on the control console according to the table above.
2. Start an exposure.
3. Check and measure the kV value and the tube current characteristic on the
oscilloscope.
The accuracy of the kV is
&
5%, for tube current
&
10% and for the mAs product
&
10%.
4. Record the measured kV and mAs value in the Startup Protocol, page 11 - 1.
5. Change the setting and continue with the next measurement until you have
completed all measurements from the table above.
Be aware, that with the AEC mode on, a pre-exposure of 50 ms is
done.
Select the correct trigger on the scope, so you get the pre-expo-
sure and the all the exposure times.
Measurement kV mAs Anode/Filter
1 25 - Mo/Mo
2 25 - W/Rh
Tab. 3 Checks with a large focus and with AEC
NOTE
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