GE MEDICAL SYSTEMS CT 9800 QUICK SYSTEM
Rev. 1 Direction 18000
4-9-1
SECTION 9 SYSTEM INTEGRATION
9-1 X-Ray Alignment Check
Refer to Chapter 6 of SM9800B for the X-Ray Alignment Check Procedure.
9-2 Laser Alignment Check
Verify presence of nameplates on gantry regarding laser precautions. Refer to Illustration 4-9-1.
DANGER: LASER RADIATION WHEN OPEN
AVOID DIRECT EXPOSURE TO BEAM TO PREVENT EYE INJURY.
WARNING: LASER APERTURE DO NOT STARE INTO BEAM.
Caution: Laser radiation do not stare into beam.
1. Initialize the TGGC.
2. Press LIGHTS switch on the table.
3. Ensure gantry rotates to 0° Azimuth. Check by sighting alignment pins.
4. Check all alignment lights are on.
5. By holding a sheet of paper across the internal axial plane, check that left and right axial beams are
coincident ± 1.5mm.
6. Move the sheet of paper forward across the external axial plane. Check that left and right axial beams
are coincident ± 1.5mm.
7. At both internal and external axial positions, check that the left and right coronal beams are
coincident, ± 3mm.
8. Tilt gantry ± 20° and check coronal beams stay coincident, ± 3mm.
9. Extend cradle into sagital beam. Check that sagital beam is along the center line of the cradle ± 3mm.
10. Tilt the gantry forward 20° and check sagital beam still extends further out of the gantry than the external
axial plane.
11. Return gantry to 0° tilt.
12. Place the large calibration poly phantom onto the phantom holder and move the phantom to align with the
external alignment reference.
13. Press the EXT LM button.
14. Check that the axial beam spans an angle of ±100° around top of phantom.
15. Using a suitable marker, mark the coronal, sagital and axial planes on the outside edge of the phantom.
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