Dose calculator
MAMMOMAT Balance SPB7-115.840.01 Page 46 of 62 Siemens AG
Troubleshooting Guide Rev.02 10.04 Medical Solutions
• put a semi-rigid sponge under the compression
paddle and compress
• read the Source to Skin distance from the
display pushing, in Manual Mode, the BELL
button together with kV(-) button
• measure the Source to Skin distance between
Tube Focal Spot and lower surface of
compression paddle
• input the difference in mm. between the two
values in the “Paddle Offset” box
• store configuration values into the Mammo unit
• check that now Source to Skin distance on the
display is correct.
The measurement at these parameters takes into
account the deformations of the compression system as
recommended at clause A3.2.1 of the European
Protocol of Dosimetry in Mammography.
Correct Dosimeter operation is guaranteed only if
correct configurations as described in the Operator’s
manual are respected.
FOCAL SPOT DISTANCE
The focal spot distance above the upper plane of the
arm can depend on the specific tube installed.
The correct measurement of this parameter is crucial for
the measure accuracy of the Dose.
Using a calliper, measure the distance in mm. and input
the value in the box “ Focal Spot distance (mm)”
ANODE CURRENT @ 28kV
For Tube Output and Tube Dose Rate calculations,
value in mA of Anode Current @ 28kV in Manual Mode
is essential, typical value is 90mA but in any case refer
to Tube Calibration report for specific value.
To Next Page
Loading...
