PXS-710D Section 2
44
2.7 BEAM ALIGNMENT
Tighten yoke block to prevent movement during alignment. Rotate Collimator so
that the knobs are facing front and tighten lock. Remove the collimator outer
shroud by removing the 4 screws securing the shroud to the collimator. Place the
phosphor screen in the beam at 30.6" and collimate field just to the outside edge
of the middle 5” x 7” rectangle. Place Beam Alignment Tool in center of field
(center dot at intersection of centerlines) and adjust beam so that shadow of
upper dot covers lower dot. Readjust borders if necessary.
Set the Control Module to 70kV, 20.0 mAs. Take an exposure while observing the
X-Ray field through the lead glass window of the test cabinet. Note the
difference observed between the light field and the X-Ray field for further
adjustment.
If the centers are too far out of alignment, adjustment of Collimator light field is
necessary. To adjust the horizontal position of the light field, rotate the unit 180
degrees to gain access to the mirror adjustment hardware. Loosen the locking
screws sufficiently so as to allow the turning of the adjuster cam. Lock the fixing
screw and cam after adjusting the mirror position. To adjust the vertical position
of the light field, remove the lamp heat dissipater taking care to avoid being
burned, as the dissipater can be very hot. Loosen the two lamp support fixing
screws and using the hexagonal screw on the side of the lamp, adjust the lamp
in the desired direction. Tighten the four screws fixing the lamp support.
Finally, to adjust the brightness at the edges of the light field, loosen the screws
fixing the screen to the lamp holder, and using an Allen screws, move the screen
to obtain the desired adjustment. Tighten the screen fixing screws.
To Next Page
Loading...