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GENERAL
ELECTRIC
MEDICAL
SYSTEMS
AMX-II X-RAY UNIT
7-1576
SM A0654E
3.
New Style HRT-09N Tube Units (focal spot to accessory mounting surface distance of 2-5/16"'):
(58.74 mm)
Refer to Illustration 4-7.
Discard the adapter plate and the 10-32 unf x 3/4" hex hms.
Fasten the
interface plate directly to the tube unit with the 9/16" hex eccentrics and the 10-32 unf x 1/2" hex
hms furnished.
Do not tighten the machine screws at this time.
Remove the protective plastic cap from the collimator alignment fixture.
Attach the alignment fix-
ture to the interface plate with the three 8-32 unf x 3/4" hex soc hms.
Use the 7" (177.8 mm) shank
Allen wrench furnished with the collimator.
See Illustration 48.
Rotate the tube unit and alignment fixture for a horizontal x-ray beam.
WARNING:
FOR PROPER APPLICATION DURING ALIGNMENT, USE THE FOLLOWING X-RAY
4,4
TECHNIQUES
60 KVP, 200 MAS (2 seconds)
THE ALIGNMENT FIXTURE IS DESIGNED TO PROVIDE SUFFICIENT RADIATION
PROTECTION WHEN THE TUBE UNIT IS OPERATED AT OR BELOW THESE TECH-
NIQUES.
A PIECE OF LEAD GLASS (MINIMUM LEAD CONTENT-2.3MM LEAD
EQUIVALENT AT 150 KVP) ALREADY MOUNTED AT THE BOTTOM OF THE
FIXTURE MAKES IT SAFE TO LOOK INTO THE FIXTURE WITH THE NAKED
EYE.
HOWEVER, AS WITH ANY X-RAY EXPOSURE, A LEAD PROTECTIVE
SCREEN, LEAD APRON, OR OTHER PROTECTIVE MEDIUM SHOULD BE USED.
IF AVAILABLE, TO AVOID UNNECESSARY RADIATION EXPOSURE.
Darken the room and have an assistant make 60 KVP, 100S ma, 2 sec. exposure.
Looking into
the bottom of the alignment fixture, observe correlation of the x-ray pattern with the crosshairs
on the screen.
|
Observe the image of the small focal spot.
When properly aligned, the crosshairs and focal spot
image should coincide.
Using the 9/16" hex eccentrics, shift the interface plate in the direciton needed for correct alignment.
(Using the open end wrenches furnished with the collimator, rotate opposite eccentrics in opposite
directions to shift the interface plate position.)
Repeat Steps 4 and 5 until alignment is satisfactory, then tighten the four 10-32 unf hex hms.
After
tightening the screws, recheck the alignment to make certain it has not changed.
Rotate the tube unit and alignment fixture back to a vertical position.
Remove the alignment fixture
and replace the protective cap.
4-10
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