Section 4 - Alignment & Calibration
4-31
If the global S.D. is greater or equal to 2.0
, then the machine is not aligned properly. Check the
following:
•
If the image appears "streaky" or "banded", check for loose wires or other debris
between the table and the tank.
•
Check the C-arm parallelism (page 4-3).
•
Check the aperture alignment (page 4-9).
•
Check beam flattening (page 4-28).
•
Re-run daily QC (see the
QDR 4500 User's Guide).
After realignment, repeat the AIRSCAN test. If the global S.D. is less than 2.0, you are done. If
the global S.D. if equal or greater than 2.0, the non-uniformity may be attributed to the table
itself. If so, continue with this procedure.
Check to see if the machine has body composition loaded. Then follow the appropriate procedure
below.
Machines using Body Composition Analysis (BCA)
Machines performing BCA must be held to having a global S.D. of less than 2.0. If the
realignment and recalibration above has been performed, then the table top needs to be replaced.
Note:
Archive the airscans you have acquired and either e-mail or Fed. Ex. them to a Hardware
Support Specialist for final evaluation.
Machines using BMD Whole Body Analysis
Machines using only BMD Whole Body measurements can tolerate a larger S.D. If the global
S.D. is less than 3.0, then you are done. In the S.D. is equal or greater then 3.0, then the table top
needs to be replaced.
Note:
Archive the airscans you have acquired and either e-mail or Fed. Ex. them to a Hardware
Support Specialist for final evaluation.
If the customer upgrades to the Body Composition Analysis option, you must re-evaluate
the table global S.D. to less than 2.0.
LATERAL ALIGNMENT TEST (QDR 4500A AND SL)
This procedure verifies lateral alignment.
1.
Press Center Table on the control panel to move the table and C-Arm to the center
position.
2.
Press Laser on the control panel to turn the laser light on.
3.
Place the spine phantom on the table top so the laser is on the laser target and the
vertebrae are to the right of the laser (use the same target used for normal QC scans).
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