GE Healthcare Senographe DS
Revision 1 Service Information and Procedures Class A 2385072-16-8EN
Job Card CAL A046 - Half-Value Layer Measurement
Page no. 1705 Chapter 9
JC-CAL-A-046.fm
10. Place 0.2 mm aluminum on top of the compression paddle; verify using the light beam that the alumi-
num sheet fully covers the ionization chamber field of view.
11. Take the calibration exposure (press the Exposure button on the X-ray Console) with the 0.2 mm
aluminum sheet on the compression paddle, and read the dose value on the dosimeter.
12. Press Set Up once on X-ray Console, select Meas.D, enter the dose value E
0
in mGy (see Notice
above) and press Valid.
13. Press Set Up twice, and select 0.5
14. Place 0.5 mm aluminum on top of the paddle. Verify using light beam that the aluminum sheet fully
covers the ionization chamber field of view.
15. Take the calibration exposure (press the Exposure button on the X-ray Console) with the 0.5 mm
aluminum sheet on the compression paddle, and read the dose value on the dosimeter.
16. Press Set Up once on X-ray Console, select Meas.D, enter the dose value E
0
in mGy (see Notice
above) and press Valid.
17. Press Set Up twice, and press Calcul.
18. Press Set Up, press Param, verify that the value is within the limits given below (Acceptable Values)
19. If the values are within limits, the Senographe stores HVL and Yield values.
If not, check the following and repeat the calibration:
• Paddle is present,
• Dosimeter is properly calibrated,
• 6M probe is correctly placed in the high position of the dosimeter holder tool
• Tube tilt and format are correctly calibrated, and probe is in the 9x9 field of view
• Generator kV and mA are properly calibrated.
If the calibration still fails, the tube must be replaced.
20. Repeat steps 6 through 19 for the other track/filter/focal spot combinations: LF/MoRh, LF/RhRh
techniques, and once all three combinations are complete, proceed to step 21.
21. Press Set up and perform a checksum (SETUP/GENE/INSTAL/CKSUM/CKSUM).
22. Press Set up and exit the Calibration Menu.
23. Insert Magstand Simulator.
Note:
Even if the Senographe system is not delivered with the Mag Stands, you must still perform all of
the Small Focus (Mag Mode) calibrations listed below. This is because the Magnification Option
Installation Manual does not include a Job Card to perform the HVL Measurement in Mag Mode.
24. In the HVL/Yield calibration menu on the X-ray Console, enter the path corresponding to the Small
Focus (SF) configuration you are measuring:
The Senographe automatically selects the acquisition parameters (see table above).
25. Take the calibration exposure (press the Exposure button on the X-ray Console) with no alumi-
num sheet on the compression paddle, and read the dose value on the dosimeter.
Configuration X-Ray Console Path
Mo/Mo SET UP/GENE/INSTAL/GENE/DOSE /SF/MOMO/CALIB/0/CALIB
Mo/Rh SET UP/GENE/INSTAL/GENE/DOSE /SF/MORH/CALIB/0/CALIB
Rh/Rh SET UP/GENE/INSTAL/GENE/DOSE /SF/RHRH/CALIB/0/CALIB
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