Ziehm Imaging, Inc.
Vision Installation Manual
MAN 06-0015, Rev. A
Page 30
M a i n t e n a n c e R e p o r t : C h e c k C o l l i m a t i o n
Check Collimation
Federal Regulation
Federal regulations (21 CRF 1020.32 (b) (2) (1)) establish that, during fluoroscopic
operation, the x-ray field in the image indicator plate must not exceed 3% of the SID
of the visible image-indicator surface - in length or width. The sum of the lengths and
widths access may not be greater than 4% of the SID.
1. Place the C-Arm in the
Basic
position.
2. Select the full image intensifier input format (i.e., no zoom).
3. Open the iris diaphragm to the maximum setting.
4. Initiate fluoroscopy by pressing the foot switch.
• If all six of the iris diaphragm leaves are visible at the edge of the monitor (as
shown in Figure 19) then
no further tests are required
.
• If all six of the iris diaphragm leaves are not visible in the monitor, proceed to
step 5.
Fig. 20
Iris Collimator Leaves Still Visible in Monitor
5. Attach a light cross, or a fluorescent screen, to the middle of the image intensifier
input.
6. Open the iris diaphragm to the maximum setting.
7. Initiate fluoroscopy by pressing the foot switch.
8. The light cross has four measuring sliders: two that move longitudinally, and two
that move latitudinally. Move both of the longitudinal sliders inwards, until they
are just visible at the edge of the monitor.
9. Release the foot switch to stop fluoroscopy.
10. Mark the position of the sliders on the light cross. (With a fluorescent screen,
mark the edge of the radiation field).
11. Initiate fluoroscopy by pressing the foot switch.
12. Move both of the latitudinal sliders inwards, until they are just visible at the edge
of the monitor.
13. Release the foot switch to stop fluoroscopy.
