OEC 9800 Periodic Maintenance Procedure
44
3.
Calculate the absolute value of the difference between the film and Workstation X axis values (X
Film
– X
Fluoro
= X
Diff
).
Verify that the difference recorded is less than 28 mm (3% SID).
4.
Calculate the absolute value of the difference between the film and Workstation Y axis values (Y
Film
– Y
Fluoro
= Y
Diff
.).
Verify that the difference recorded is less than 28 mm (3% SID).
5.
Calculate the sum of the values in Steps 3 and 4 (X
Diff
+ Y
Diff
= Sum). Verify that the sum is less than or equal to 36
mm (4% SID).
MAG2 Field Verification
Record the values measured and calculated for each of the following steps, on the PM Form.
1.
Using the film, measure the Normal field exposure X and Y (X
Film
and Y
Film
) diameters and record them in the
measurement table found at the end of the Beam Alignment Test.
2.
Make a Normal mode Fluoro exposure. Using the scale on the beam alignment tool, measure the X and Y
diameters (X
Fluoro
and Y
Fluoro
) displayed within the digital mask on the Workstation.
3.
Calculate the absolute value of the difference between the film and Workstation X axis values (X
Film
– X
Fluoro
= X
Diff
).
Verify that the difference recorded is less than 28 mm (3% SID).
4.
Calculate the absolute value of the difference between the film and Workstation Y axis values (Y
Film
– Y
Fluoro
= Y
Diff
.).
Verify that the difference recorded is less than 28 mm (3% SID).
5.
Calculate the sum of the values in Steps 3 and 4 (X
Diff
+ Y
Diff
= Sum). Verify that the sum is less than or equal to 36
mm (4% SID).
Pass or Fail
If the measurements recorded for each field size (50 mm x 50 mm, NORM, MAG1 and MAG2) are within the limits
specified indicate that the Beam Alignment Test “Passed” on the PM Form. If the measurements recorded for each
field size are not within the limits specified indicate “Failed” on the PM Form and perform the Radiographic Beam
Alignment procedure found in the Service Manual.
