GE
HEALTHCARE
D
IRECTION
2307224-100, R
EVISION
6
D
ISCOVERY
LS S
YSTEM
S
ERVICE
M
ANUAL
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
2.) Reset the software alignment parameters – Section
.
3.) Position the VQC phantom – Section
4.) Scan and reconstruct the VQC phantom – Section
5.) VQC processing and software realignment – Section
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.) PET gantry adjustment – Section
9.) Repeat
through
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.
