Light Field Alignment - GE Alpha RT 32551 Installation Instructions Manual

32551-IMG rev 6
If it is necessary to make any adjustments, remove the lower cover of the
C-arm.
The diaphragm holder can be moved by loosening the two screws on one
side and tightening the respective screws on the opposite sides (A in
figure 5.10, X-ray field adjustment).
Fig 5.10. X-ray field adjustment
Return to the normal mode by briefly pressing the kV- and density-
buttons simultaneously. The timer display shows "nor" when the buttons
are released.
5.2.12

Light field alignment

The x-ray field adjustment must be checked and aligned prior to the light
field alignment. Place a loaded cassette in the holder and position the
corresponding diaphragm.
1 Go into the service mode by pressing the kV- and density- buttons
simultaneously and holding them until "ser" is displayed on the timer
display.
2 Select manual mode at 25 kV and 20 mAs.
3 Place a sheet of white paper on the cassette holder so that the light
field can be seen clearly. Place some coins at the corners of the
illuminated area on the cassette holder. Make an exposure and
develop the film.
The coins outlined on the film should not be more than 5 mm out of the
exposed field and sum of misalignments on opposite sides not more than
10 mm.
Light field correction for 12V 50W bulb
Loosen screws A and move the mirror B until the light field is adjusted. See
Fig. 5.11, Light field alignment.
GE Healthcare
5 Setups, alignments and adjustments
75