Chapter 9 Page no. 1702
JC-CAL-A-045.fm
GE Healthcare Senographe DS
Revision 1 Service Information and Procedures Class A 2385072-16-8EN
Job Card CAL A045 - Conversion Factor Measurement
6-2 Procedure
1. Launch the Service Desktop (see Launching the Service Desktop on page 120).
2. From the Service Desktop, click the Calibration button and select Detector/Detector/CF Mea-
surement.
3. Before starting the calibration, follow the on-screen instructions for pre-requisites.
4. Select Conversion Factor Measurement and start.
5. Follow the on–screen instructions;
a. Remove the Bucky and the compression paddle.
b. Install the Dosimeter Support.
c. Install the Radiation Protection Plate.
d. Place the IQST phantom on the dosimeter support and the dosimeter in the low position (Source–
Dosimeter Distance = 622.5 mm).
e. Take an exposure (parameters set automatically: Rh/Rh; 30 kV; 56 mAs).
f. Read the dosimeter and enter the dose value (in microGray or mR).
g. Remove the Dosimeter and Radiation Protection Plate.
h. Take a second exposure using the same technique.
6. The IDC calculates the brightness level in the pre-defined region of interest.
7. The IDC computes the counts/microGray value and checks the result. If good, it displays the mes-
sage Calibration successful.
6-3 Error codes
• Calibration calculation failed.
6-4 Completion
If you are handing the machine back to the user at this point, switch the Senographe off, then on again.
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