GE Senographe DS, Manual

Page: 1087 / 1810

GE Healthcare Senographe DS
Revision 1 Service Information and Procedures Class A 2385072-16-8EN
Job Card TSG M028 - E24 084/008 Error Troubleshooting
Page no. 1087 Chapter 9
JC-TSG-M-028.fm
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 Job Card TSG M022 - HV Troubleshooting on page 1403 does not report any
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
section 7 , DMR
Heater Current Management on page 1090 .
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
Completion section of Job Card D/R A261 - X-ray Tube
Assembly on page 1353 .
Perform the following calibrations:
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
Calibrations - Checks Job Card
Acquisition Image Chain
Bias Calibration Job Card CAL A003 - X-Ray Tube Focal Bias Voltage Scale Factor on
page 1655
Heating Current Calibration Job Card CAL A001 - Heater Current Scale Factor on page 1649
mAs X-ray Calibration Job Card CAL A012 - X-Ray Tube Heater Current on page 1673
Tube Tilt Calibration Job Card CAL A027 - Tube Tilt Calibration on page 1681
Collimator Calibration Job Card CAL A029 - Collimator Format Calibration on page 1683
Collimation Check Job Card ELE A028 - Collimation Checks on page 679
If Collimation Check not OK, repeat Collimator Calibration
Bad Pixel Calibration Job Card CAL A041 - Bad Pixel Calibration on page 1693
Gain calibration Job Card CAL A043 - Detector Gain Calibration on page 1697
flat field tests Job Card ELE A032 – IQ Tools Flat Field Test on page 699
If IQ Tests not OK, repeat all calibrations from Bad Pixel.
Half Value Layer Job Card CAL A046 - Half-Value Layer Measurement on page 1703
Conversion Factor Job Card CAL A045 - Conversion Factor Measurement on page 1701
Use the same dosimeter as that used for CAL A046
AOP: Automatic Optimization of Parameters
AOP Calibration Job Card CAL A051 - AOP Calibration on page 1723
mAs non linearity Job Card CAL A053 - mAs Non-linearity Calibration on page 1725
AOP/SNR Check Job Card ELE A038 - AOP Mode and SNR Check on page 707
If AOP/SNR Test not OK, repeat all calibrations from AOP Calibration