GE Healthcare Senographe DS
Revision 1 Service Information and Procedures Class A 2385072-16-8EN
Job Card CAL A045 - Conversion Factor Measurement
Page no. 1701 Chapter 9
JC-CAL-A-045.fm
Job Card CAL A045 - Conversion Factor Measurement Chapter 9
1 SUPPLIES
None
2TOOLS
• Radcal 2026 Dosimeter
• 6M ionization chamber (6cc) calibrated at mammographic X ray beam energies
• Dosimeter support with Radiation Protection Plate
• IQST Standard Phantom
3 REQUIRED EFFORT
Personnel: 1 Field Engineer
Time: 15 minutes
4 SAFETY PRECAUTIONS
WARNING
This procedure requires the use of X–rays; take all due precautions.
5 PREREQUISITES
None
6 CONVERSION FACTOR MEASUREMENT
6-1 Description
The Conversion Factor is required for AOP (Automatic Optimization of Parameters) calculations. It is
determined by using a dosimeter to measure the X–ray dose while acquiring an image. This value is
compared with the brightness of the corrected image to give a Conversion Factor, used by the system to
convert brightness to dose for all AOP–related calculations. The brightness and dose values are also
sent to the AWS for the image quality tests.
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