GE Senographe DS Manual page 1704

GE Healthcare
Revision 1
Job Card CAL A046 - Half-Value Layer Measurement
other configurations.
8 PROCEDURE
! Notice:
The dose values to be entered in the X-ray Console menu must be expressed in mGy.
- If your dosimeter displays dose values in mR, divide the reading by 114.2 to obtain mGy.
If your dosimeter displays dose values in μGy, divide the reading by 1000 to obtain mGy.
-
Note that you must use the format x.xxx E+0 to enter a dose value x.xxx.
1. Ensure that paddle decompression at end of exposure is set to "NO". In the X-ray Console menu, set:
MEDICAL/DECOMP/DECOMP/NO
2. Place the standard 19 cm x 23 cm compression paddle upside down as close as possible to the X-
ray tube.
3. Remove the Bucky or breast support; place the Dosimeter Support with Radiation Protection Plate on
the image receptor.
4. Place the dosimeter with 6M chamber on the high position of the Dosimeter Support (the source-to-
dosimeter distance SDD = 592mm).
5. Select the 9 x 9 collimator format; verify using the light beam that the 6M ionization chamber is fully in
the beam.
6. In the HVL/Yield calibration menu on the X-ray Console, enter the path corresponding to the Large
Focus (LF) configuration you are measuring:
Configuration
Mo/Mo
Mo/Rh
Rh/Rh
The Senographe automatically selects the acquisition parameters (see table above).
7. Take the calibration exposure (press the Exposure button
num sheet on the compression paddle, and read the dose value on the dosimeter.
8. Press Set Up once on X-ray Console, select Meas.D, enter the dose value E
above) and press Valid.
9. Press Set Up twice, and select 0.2.
Chapter 9
Service Information and Procedures Class A 2385072-16-8EN
SET UP/GENE/INSTAL/GENE/DOSE /LF/MOMO/CALIB/0/CALIB
SET UP/GENE/INSTAL/GENE/DOSE /LF/MORH/CALIB/0/CALIB
SET UP/GENE/INSTAL/GENE/DOSE /LF/RHRH/CALIB/0/CALIB
Page no. 1704
X-Ray Console Path
on the X-ray Console) with no alumi-
Senographe DS
in mGy (see Notice
0
JC-CAL-A-046.fm