LORAD AFFINITY Series, Service Manual

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4-48 P/N 9-500-0255
Service Manual
Chapter 4: Calibrations and Performance Checks
X-ray and Light Field Check and Alignment Procedures
3. Slightly loosen the two inner screws securing the lower right/front alignment
blade (Figure 4-11, Item 3) to the base plate (Figure 4-11, Item 4) of the
aperture. Loosen just enough so that minimal effort is required to move the
blade.
4. Slide the Auto Aperture into the tubehead slot.
5. Set the exposure techniques for Large focal spot, Manual, 25 kV and 100 mAs.
6. Making exposures as necessary, adjust the right and front edges of the blade to
align within the markings on the alignment template (Figure 4-10).
7. Tighten the two inner screws, securing the right and front edges to the aperture
base plate.
8. Remove the Auto Aperture from the tubehead slot.
9. Replace the top plate and left/back alignment blade. Leave the screws loose
enough so minimal effort is required to move the blade.
10. Slide the Auto Aperture into the tubehead slot.
11. Making exposures as necessary, adjust the left and rear edges of the blade to
align within the markings on the alignment template.
12. Tighten the four outer screws, securing both shields to the upper and lower
aperture plates.
13. Verify the beam position again to ensure the blades did not move when
tightening the hardware.
7.4.2 Align the 18 x 24 cm Large Focal Spot
1. Remove the Auto Aperture from the tubehead slot.
2. Remove the 24 x 30 cm Cassette Sensor Simulator from the breast tray and
install blockers in the aperture sensor (Figure 4-13, Item 2) for large focal spot.
Note… A blocker is anything that can be inserted into the aperture sensor (i.e.
cotton swabs, wadded paper) that will make the sensor think an aperture is
installed.
3. Initiate an exposure and note the location of the edges of the x-ray beam relative
to the 18 x 24 cm markings on the alignment template. If the edges of the beam
are not aligned properly, adjust the auto aperture as follows:
A. Slightly loosen the four screws (Figure 4-13, Item 1) securing the auto aper-
ture adjustment blades just enough so that minimal effort is required to
move the blades.
B. Making exposures as necessary, adjust the rear blade so that it is parallel to
the rear edge markings on the alignment template.