GE HEALTHCARE
DIRECTION 2307224-100, REVISION 6DISCOVERY LS SYSTEM SERVICE MANUAL
Chapter 8 - System QC, Calibration and Functional Tests Page 243
Chapter 8 - System QC, Calibration and Functional Tests
For PET calibration procedures, performance test procedure, and clinical walk-through procedure,
refer to the Advance PET Imaging System Service Tools and Procedures, Direction 2120809.
8.1 System QC
8.1.1 CT-PET Volumetric Calibration and Quality Control Procedure (VQC)
The CT-PET Volumetric Calibration and Quality Control procedure (VQC) consists of the following
steps to be performed in the given order:
Prerequisite: CT and PET Calibration and Blank Scan updated.
1.) Perform initial table alignment – Section 8.1.1.1.
2.) Reset the software alignment parameters – Section 8.1.1.2.
3.) Position the VQC phantom – Section 8.1.1.3.
4.) Scan and reconstruct the VQC phantom – Section 8.1.1.4.
5.) VQC processing and software realignment – Section 8.1.1.5.
6.) If QC results show alignment to be within service specifications, calibration is OK. If not,
proceed to the next step.
7.) View the Mechanical Alignment table – Section 8.1.1.6.
8.) PET gantry adjustment – Section 8.1.2.4.
9.) Repeat Step 4 through Step 7.
Note: • Volumetric calibration is performed as a part of initial system installation and calibration. Every
time a new CT or PET software installation is performed, the Volumetric Quality Control (VQC)
test must be performed.
• VQC testing and, if necessary, calibration must also be performed after each PET gantry service
movement and after running the CT table characterization procedure.
8.1.1.1 Initial Table Alignment
As a prerequisite to the VQC calibration procedure, the secondary base of the table must be initially
aligned. For a full description of the initial table alignment, refer to the Discovery LS Installation
Manual, Direction 2289039-100, Section 5.2.2 - Initial Table Positioning.
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