Chapter 7 Page no. 712
JC-ELE-A-039.fm
GE Healthcare Senographe DS
Revision 1 Service Information and Procedures Class A 2385072-16-8EN
Job Card ELE A039 - Compliance with Germany for Detector Dose
6-3 Calculation of New Parameter A
Adjust the AOP calibration:
1. On the X-ray Console, go to the menu GENE/INSTAL/GENE/AOP/APOLLO/CALIB/.
2. Select the configuration GridLF/PARAM/LFRhRh.
Note the value of parameter A (A
old
):
3. Calculate the new AOP parameter A
new
:
4. A
new
= 4.66 - (STD Radiological thickness from Table 1) + A
old
.
5. Change the parameter Aold by A new in X-ray Console menu.
6. Perform a checksum (SETUP/GENE/INSTAL/CKSUM/CKSUM).
6-4 Exposure with New Parameter A
1. Repeat one exposure for each AOP mode with 4.5 cm acrylic thickness on the Bucky and compres-
sion of 4 daN.
2. Note the exposure parameters in the following table:
TABLE 2 -
The radiological thickness must be in the range 4.65 to 4.67. If not, check your calculation of the param-
eter A
new
.
The composition must be in the range 40% to 60%. If not, adjust the mechanical thickness by applying a
different compression force, which must increase the mechanical thickness. The increase of mechanical
thickness causes a decrease of composition. When the composition is in the range 40% to 60%, repeat
steps 1 and 2.
A
old
A
new
AOP mode Spectrum (Target/
Filter, kVp)
mAs Radiological thickness,
cm
Composition, %
CNT RhRh29
STD RhRh29
Dose RhRh29
To Next Page
Loading...
Need help?
General
