GE Healthcare Senographe DS
Revision 1 Service Information and Procedures Class A 2385072-16-8EN
Job Card CAL A046 - Half-Value Layer Measurement
Page no. 1707 Chapter 9
JC-CAL-A-046.fm
8-2 Information:
The Senographe automatically computes the HVL by interpolation using the following formula:
(the units are mm of Al)
Where E
0
, E
0.2
, E
0.5
, are dose values measured behind 0, 0.2 mm and 0.5 mm aluminum respectively.
The Senographe calculates Tube Yield as E
0
/ mAs (unit: mGy/mAs) for this technique.
9 COMPLETION
If you are handing the machine back to the user at this point, switch the Senographe off, then on again.
)Ε/ Ε(
)/(2∗0.2− )/
=
0.50.2
ln
E E lnE E ln(2*0.5
HVL
00.500.2
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