GE HEALTHCARE
DIRECTION 2307224-100, REVISION 6DISCOVERY LS SYSTEM SERVICE MANUAL
Page 352 Appendix B - System Calibration Quick Guide
4. PET Blank Scan 30 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.
At the end of the weekly blank scan, if good
sinograms are obtained and transmission
acquisitions are needed, it is recommended to
use the following process for correction:
1. Full QA
2. Blank Scan
3. Processing
4. Next Recon
5. Select Blank Scan data by date and time
and click OK.
6. Output = Correction
7. Submit to Top
5. Tube Warm- Up 1 Minute
1. Exam Rx
2. Daily Prep
3. Tube Warm-Up
4. Accept and Run Tube Warm-Up
5. Quit
Do Tube Warm-Up if no CT scans were done
in the last two hours. During activation, a
message box displays in the upper right of the
screen. In addition, information about the
process displays in the center of the screen.
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