9600 Periodic Maintenance Procedure
00-880606-02
Page 37
5. Select
Manual - Fluoro
and completely close the collimator iris. Select
Film mode
. Take a 50 kVp
@ 0.9 mAs exposure.
6. Remove the film cassette and develop the film.
7. Verify the exposure, with the collimator iris closed, is within 50 mm square in the middle of the
alignment tool. If a stop sign pattern is displayed, measure the image from the center of flats.
8. Using the film, measure and record the
Normal
field X and Y exposure diameters.
9. Make
a
Normal
mode fluoro exposure. Using the scale on the beam alignment tool, measure and
record the X and Y diameters displayed within the digital mask on the Workstation.
10. Calculate and record the absolute value of the difference between the film and Workstation X axis
values as follows: XN =
|
X
Step 8
-
X
Step 9
|
Verify the difference is less than 28 mm (3% SID).
Write the XN value on the form.
11. Calculate and record the absolute value of the difference between the film and Workstation Y axis
values as follows: YN =
|
Y
Step 8
-
Y
Step 9
|
Verify the difference is less than 28 mm (3% SID).
Write the YN value on the form.
12. Calculate and record the sum of XN and YN as follows: SumN = XN + YN.
Verify the sum is less than or equal to 36 mm (4% SID).
Write the SumN value on the form.
13. Using the film, measure and record and
MAG 1
field X and Y exposure diameters. If a stop sign
pattern is displayed, measure the image from the center of flats. If curvature of the flat side is
observed, measure from the center of the flats as though the sides were flat (connecting corner to
corner in a straight line).
14. Make a
MAG 1
mode fluoro exposure. Using the scale on the alignment tool, measure and record
the X and Y diameters displayed within the digital mask on the Workstation.
15. MAG 1 field
—
Calculate and record the absolute value of the difference between the film and
Workstation X axis values as follows: X1 =
|
X
Step 13
-
X
Step 14
|
Verify the difference is less than 28 mm (3% SID).
Write the X1 value on the form.
