GE Senographe DS Manual page 1087

GE Healthcare
Revision 1
5 PREVENTIVE ACTIONS THAT MAY REDUCE TUBE ARCING
During tube lifecycle, it is normal to observe tube arcing, which generates exposure spit/interruption.
Note:
Do not plan to replace the tube if tube arcing occurrence is low (1 tube arcing every 400 exams).
Nevertheless, it is recommended to perform the calibrations below.
Tube arcing may:
• Occur more frequently for brand new and old tubes
• Increase with tube usage as a result of wrong or inaccurate generator calibrations.
It may be possible that
corrective action. Intermittent arcing failure may result from a calibration or a heater current that is not
adjusted to the current tube state. For information on heater current regulation, see
Heater Current Management on page
Since tube usage may change the tube characteristics, it may be useful to perform all the calibrations
that are required at tube change. See the
Assembly on page 1353.
Perform the following calibrations:
Calibrations - Checks
Acquisition Image Chain
Bias Calibration
Heating Current Calibration
mAs X-ray Calibration
Tube Tilt Calibration
Collimator Calibration
Collimation Check
Bad Pixel Calibration
Gain calibration
flat field tests
Half Value Layer
Conversion Factor
AOP: Automatic Optimization of Parameters
AOP Calibration
mAs non linearity
AOP/SNR Check
If AOP/SNR Test not OK, repeat all calibrations from AOP Calibration
Considering that tube arcing may result from a tube instability regarding its heater state, if the generator/
tube calibration doesn't reduce the tube arcing occurrence, you may ask the operator to perform the
heating procedure for the selected focal spot size (large or small) when the system has not been used
JC-TSG-M-028.fm
Service Information and Procedures Class A 2385072-16-8EN
Job Card TSG M022 - HV Troubleshooting on page 1403
1090.
Completion
Job Card CAL A003 - X-Ray Tube Focal Bias Voltage Scale Factor on
page 1655
Job Card CAL A001 - Heater Current Scale Factor on page 1649
Job Card CAL A012 - X-Ray Tube Heater Current on page 1673
Job Card CAL A027 - Tube Tilt Calibration on page 1681
Job Card CAL A029 - Collimator Format Calibration on page 1683
Job Card ELE A028 - Collimation Checks on page 679
If Collimation Check not OK, repeat Collimator Calibration
Job Card CAL A041 - Bad Pixel Calibration on page 1693
Job Card CAL A043 - Detector Gain Calibration on page 1697
Job Card ELE A032 – IQ Tools Flat Field Test on page 699
If IQ Tests not OK, repeat all calibrations from Bad Pixel.
Job Card CAL A046 - Half-Value Layer Measurement on page 1703
Job Card CAL A045 - Conversion Factor Measurement on page 1701
Use the same dosimeter as that used for CAL A046
Job Card CAL A051 - AOP Calibration on page 1723
Job Card CAL A053 - mAs Non-linearity Calibration on page 1725
Job Card ELE A038 - AOP Mode and SNR Check on page 707
Job Card TSG M028 - E24 084/008 Error Troubleshooting
section of Job Card D/R A261 - X-ray Tube
Job Card
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Senographe DS
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section 7, DMR
Chapter 9