Hologic DISCOVERY A, Техническое руководство

Страница: 152 / 274

Discovery QDR Series Technical Manual
4-30
7. Check that phantom covers the whole beam. This is critical. If phantom does not
cover the whole beam, move it until it does. Keep the phantom as straight as pos-
sible.
8. Turn off X-rays with the
<F2>
key and press
<Esc>
to exit X-Ray Survey.
Reboot the PC, logon as Field Service, and restart the software in Service Mode
to return to Discovery Main Menu screen.
9. Select
Utilities|Service Utilities|Detector Flattening
. Click the Continue
button. This procedure can takes about 10 minutes on a C or W model and 50
minutes on an A or SL.
10. When flattening is complete, run a QC scan and cancel adding it to the QC plot.
11. Use the Scan File Plot utility to check X-ray beam flatness of the QC scan per-
formed in Step 10.
4.11 Lateral Alignment Test (QDR 4500A and
SL)
This procedure applies to A and SL systems only. Use this procedure to verify lateral
alignment.
This procedure verifies lateral alignment.
1. On the control panel press Center to move the table and C-Arm to the center
position.
2. On the control panel press Laser on the control panel to turn the laser light on.
3. Place the spine phantom on the table top with its laser target towards the left (foot
end) and the vertebrae to the right (head end).
4. Align the phantom so that the laser crosshair is on the phantom laster target.
Using the laser as a guide, adjust the phantom to be parallel to the table edges
(just like when performing a QC scan).
5. On the APEX/QDR main screen, select Perform Exam.
6. Create a test patient biography.
7. Select OK at patient Confirmation Screen.
8. On the Select Scan Type screen select AP/Lateral Pair. Uncheck Use Default
Scan Mode and click Next.
9. Select Array and click next.
10. On the Select Lateral Scan Mode screen select Array and click Next.
11. Verify the alignment of the spine phantom to the laser.
12. Change Scan Length to 6.0 inches and click Start Scan to perform the AP scan.
13. When scan has finished, select Spine as the analysis method, and click Next.