GE MEDICAL SYSTEMS CT 9800 QUICK SYSTEM
Rev. 19 Direction 18000
6-9A-15
9A-7 Radial Alignment
If this is a detector installation, perform Radial alignment. Otherwise, skip this section and go directly to ISO
center. Radial alignment need only be done for detector installations or if the detector has been removed from
the gantry for any reason.
NOTE: Verify that the Tube Unit is ‘‘cold”; i.e., that it has had no more than 25 kilojoules exposure
[KV • mA • Sec/1000] within the last 30 minutes. Wait a minimum of 90 minutes from the
completion of a generator cal or other high technic exposures. Each exposure in the
procedure adds 12.8kj of heat to the tube, exposures should be made no faster than one every
5 minutes. Tube warm-up is NOT recommended prior to this procedure.
NOTE: A rough ISO center adjustment must be made prior to radial alignment. Use the ISO center
procedure (section 9A-8) and move the tube so that it is within .005” (0.10 channels) of the
correct position. Don’t bother trying to tweak it in perfectly at this point. When ISO is roughly
set, start with step 1 of Radial alignment.
Requirement: The initial starting position of the cam must be in the center of its range of motion
(Installation instructions, step 11-F).
1) Using option 3 in DC, move the tube to 0. Do not leave the DC program for the remainder of the scanning
portion of this procedure (i.e. do not exit DC until after step 4).
2) Turn off the scan breaker. Open the front gantry cover.
3) Install the rotational alignment tools on the detector. The pin must project into the X-ray beam.
See figure 6-9A-11.
4) Using default scan #9, perform a stationary scan of the pin. Record the exam number.
5) Exit DC and enter AN. After entering the exam number (if necessary), [RETURN] to get to the Scan Options
menu.
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