Ceph Upgrade
1-7032-0296-EN Rev 0
Secondary Collimator Alignment
String Alignment
A 70” piece of string or dental floss is
required for this procedure.
1. Tape one end of the string to the
tubehead focal spot located on the
back tubehead cover (raised bump).
2.
String through the secondary
collimator.
3. Pull the string taut and place the
oppo
sing end on the vertical line of
dots on the DMU.
4. With the line on the dots look at where
t
h
e line passes through the collimator.
5. Depending which side the string hits in
th
e collimator, adjust collimator as
required.
6.
Scribe a line on both sides of the
collimator block.
7. Loosen the four screws and move the
co
llimator plate in the appropriate
direction so the string does not touch
either side of the collimator.
8. Tighten only one of the four screws.
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