GE HEALTHCARE
DIRECTION 2307224-100, REVISION 6DISCOVERY LS SYSTEM SERVICE MANUAL
Page 348 Appendix B - System Calibration Quick Guide
B.1 Daily Calibrations
The procedures in the following “quick guides” can be used as guidelines by experienced users.
They are intended for reference after the user has gained an understanding of the procedures from
reading the full descriptions in the Discovery LS Operator Guide.
System 1. Reboot Subsystems 5 minutes
CT 1. Service
2. System Resets
3. Scan
4. Run
A message displays “Scan completed
successfully”. If this does not happen
after two tries, call Service.
PET 1. PET
2. Service
3. Terminal Interface Pkg
4. Tip All
5. Four screens open. In three of them
(excluding Table), type Reboot [Enter].
On each screen a message ending
“...completed normally” displays.
Close each screen after message
displays.
If this does not happen after two tries,
call Service.
2. PET Blank Scan 5 minutes
1. Full QA
2. Blank Scan
3. Acquisition (5 min. daily; 30 min. weekly)
4. Accept Setup
5. Move to Scan
6. Start Scan
If acquisition fails, a message displays
explaining the failure and giving instructions.
To view the error log:
1. Utilities
2. Error Log Viewer
3. Message Level = Programmer
4. Update Message
After acquisition, recon as sinogram:
1. Screens
2. Recon
3. Next Recon
4. Select Blank Scan data by date and time.
5. OK
6. Output = Sinogram
7. Submit to Top
Wait until Recon starts. The selected data will
display highlighted on the right during Recon,
and the number of slices processed displays.
To view, select/type:
1. Screens
2. Display
3. Mid
4. 128 x 128
5. Rows = 5
6. Columns = 7
7. OK
8. Load
9. Select Blank Scan data by date and time.
10. Select the file needed and click OK.
View the sinogram and decide whether to use
data from this acquisition. A good acquisition
usually produces a homogenous sinogram.
Significant black stripes usually indicate an
error in the acquisition or in one or more
detectors. If these appear, call Service.
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