OEC 9800 Installation Procedure
33
8.
Select
Manual - Fluoro, MAG 2 field
and then
Film
mode. Take a 55 KVp @ 1.5 mAs exposure.
9.
Select
Manual
-
Fluoro
and completely close the collimator iris. Select
Film mode
. Take a 55 KVp @ 1.5 mAs exposure.
10. Remove the film cassette and develop the film.
50 mm x 50 mm Field Verification
1.
Verify the 50 mm x 50 mm exposure, with the collimator iris closed, is within the 50 mm square in the middle of the beam
alignment tool. If a stop sign pattern is displayed, measure the image from the center of the flats.
Centering
1.
Using the film and a ruler, draw lines from corner to corner of the film. This locates the center of the film.
2.
Verify that the center of the image is centered on the center of the film.
3.
Measure the offset distance in the X and Y planes (X
offset
and Y
offset
) that the center of the image deviates from the center of the
film, then in the
Report/Checklist
, record and add those offset values. Use the following equation:
X
offset
+ Y
offset
= Sum
The sum should be less than 16mm (13/16
″
), or 2% of the SID.
4.
The offsets’ sum cannot be greater than 16mm (13/16
″
), or 2% of the SID. If it is, a beam alignment is necessary. Perform a
beam alignment procedure to correct this deviation.
Normal Field Verification
Use the Measurement Data table in the corresponding section of the
Report/Checklist
to record the measurements and calculations
for the following steps:
1.
Using the film, measure and record the Normal field exposure X and Y (X
Film
and Y
Film
) diameters.
2.
Make a Normal mode Fluoro exposure. Using the scale on the beam alignment tool, measure and record the X and Y
diameters (X
Fluoro
and Y
Fluoro
) displayed within the digital mask on the Workstation.
