Chapter 7 Page no. 682
JC-ELE-A-028.fm
GE Healthcare Senographe DS
Revision 1 Service Information and Procedures Class A 2385072-16-8EN
Job Card ELE A028 - Collimation Checks
6. When placing each of the XR-M film strips, ensure that edge of the light field is aligned with the X
marker on the XR-M film strip.
Note:
When aligning the light field with the X marker on the XR-M film strip, to ensure the light edges are
sharply resolved light, it is recommended that you perform this aligment with the room lights off.
Note:
At the anterior edge of the light field (opposite the chestwall edge), the Bucky cover might obstruct
the XR-M, such that it cannot lie flat with the surface of the aluminium attenuator. If there is ob-
struction from the Bucky, align the "-2" reference line of the XR-M film (instead of the "X" reference
line) so that the XR-M film avoids the obstruction and can lie flat with the surface of the aluminium
attenuator.
Edge of light field
There may be a shadow towards
the edge of the light field. Ensure
the X marker is on the outer edge
of the shadow.
Outer edge
Inner edge
Bucky cover can obstruct the XR-M
film such that it does not lie flat
against the aluminium attenuator.
Anterior edge of
light field
Repositioning the XR-M film to use
the "-2" reference instead of the "X"
reference can avoid the obstruction
from the Bucky cover.
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