QDR
4500 Technical Manual
B-2
NEW QDR A Hologic fan-beam system just installed, typically a QDR
4500.
ORIGINAL QDR An existing Hologic fan-beam system, typically a QDR 2000 or
2000
plus.
NEW PHANTOM The phantom that came with the NEW QDR.
ORIGINAL PHANTOM The phantom that came with the ORIGINAL QDR.
Six Steps to Cross-Calibration
In this procedure, you will perform the following six steps:
1.
Check the ORIGINAL QDR's Calibration.
2.
Archive the ORIGINAL QDR Patient Database and Transfer the ORIGINAL QDR
Patient Database to the NEW QDR (skip this step if the ORIGINAL QDR is not being
replaced)
3.
Cross-calibrate the NEW QDR to the ORIGINAL QDR using the ORIGINAL
PHANTOM
4.
Update the QC Database on the NEW QDR
5.
Archive the NEW QDR Database
6.
Delete all Unnecessary Phantom Scans
It is very important that all steps be performed exactly in the order given.
WARNING:
X-rays are produced during most of these tests. Keep hands, head and other body
parts out of the X-ray beam. The tester should also wear an approved radiation
dosimetry badge.
Step 1 - Check the ORIGINAL QDR's calibration and save its patient
database.
If the ORIGINAL QDR is being deinstalled, verify its calibration and save the patient database
so that can be transferred to the NEW QDR.
Proceed as follows on the ORIGINAL QDR:
1.1 Obtain the ORIGINAL QDR's current calibration readings for Area and BMC on the
ORIGINAL PHANTOM by performing one of the following two steps (1.1a or 1.1b).
Note:
Because of the possibility that the ORIGINAL QDR may have been miscalibrated, the
current Area and BMC values (as measured by the ORIGINAL QDR and recorded in its
QC database) could be different from those found on the phantom's label. Because the
operating history of the ORIGINAL QDR is very important, the measured values
produced by the ORIGINAL QDR during daily QC take precedence over the values
printed on the phantom label.
a. If the “Array Spine” QC plot shows that the ORIGINAL QDR has been stable during
at least last four weeks preceding the upgrade, use the "from" choice of the "Plot"
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