Scan Thickness Measurement & Calibration (C And W); Scan Thickness Measurement & Calibration (A And Sl) - Hologic DISCOVERY QDR Series Technical Manual

tests. Also, because the tabletop pad will have a slight affect on the test results, all
scans must be performed with it in place.
WARNING: X-rays are produced during most of these tests. Keep hands, head and other body parts
out of the X-ray beam path. The tester should also be wearing an approved radiation
dosimetry badge.
3.5.7 Scan Thickness Measurement & Calibration (C and W)
1. Press the Center Table button.
2. Turn on the laser.
3. With the laser on, place the phantom so that the laser dot is on the centerline of
the phantom, 1/2" from the left end, shining on the phantom target. The sides of
the phantom should be aligned parallel to the table, using a ruler if necessary.
4. Be sure the spine phantom has been entered in the patient database in the form of
"Spine Phantom #nnnn" (where nnnn is the number of the phantom) so that the
QC plot program can identify it properly.
5. From the Discovery Main Menu screen, select Perform Exam, select the Spine
Phantom, and click the OK button at Patient Information dialog box.
6. Select AP Lumbar Spine, uncheck default scan check box, and click the
Next> button.
7. Select Array, click the Next> button, set the scan length to 6 inches, and start
the scan.
Analyze the scan and click the Close button to exit the Analysis screen.
8.
9. Start the Field Service Calibration program by selecting Utilities|Service Utili-
ties|Field Service Calibration from the Discovery Main Menu screen.
10. Select the Spine Highs/Lows for Array Spine phantom option to automatically
calculate the new thickness indicators for array spine.
11. Select the Spine Phantom scanned in step 6 from the list of Analyzed Scans and
click the Next button. Click the Continue button on the Successfully Calcu-
lated message box.
12. Click on the Temp Write button and click the Continue button on the Success-
fully Wrote message box. Exit Field Service Calibration.
3.5.8 Scan Thickness Measurement & Calibration (A and SL)
1. From the QDR For Windows perform exam button, select the spine phantom to
be used for checking the array scan modes. This should be the one shipped with
the machine.
Note: Be sure the spine phantom has been entered in the patient database in the
form of "Spine Phantom #nnn" (where nnn is the number of the phantom)
so that the QC plot program can identify it properly.
Discovery QDR Series Technical Manual
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