GE Discovery LS - 8.1.1.7 Options; 8.1.2 Table and Gantry Alignment Procedure; 8.1.2.1.Aligning the Table

GE HEALTHCARE
DIRECTION 2307224-100, REVISION 6DISCOVERY LS SYSTEM SERVICE MANUAL
Page 252 Chapter 8 - System QC, Calibration and Functional Tests
8.1.1.7 Options
The following functions can be accessed via the [Options] button on the Planes Alignment Panel:
8.1.2 Table and Gantry Alignment Procedure
Based on the Mechanical Calibration Table described in Section 8.1.1.5, table and gantry alignment
adjustments are now performed
NOTICE Service corrections to the plane alignment adjusters may only be performed by a qualified
GE Service Engineer.
8.1.2.1 .Aligning the Table
Align the table according to the Gantry Alignment Table as follows:
1.) Move the Secondary Base PET Positioning Block by the Z distance that is indicated in the
Gantry Alignment Table as follows:
a.) Open the locking nut.
b.) If necessary, turn the Z Adjustment Screw clockwise until it rests firmly on the PET
Positioning Block.
c.) Refer to Figure 8-11. Loosen the three screws attaching the PET Positioning Block to the
secondary base.
d.) Reposition the Z Adjustment Screw by the Z measurement shown in the VQC
Transformation Panel in Figure 8-10.
e.) Close the locking nut.
Option Description of Function
View Fused Images. Displays a fusion of images of the VQC phantom in CT and PET
mode.
Show Gantry Alignment. Displays the Gantry Alignment table.
Show Mechanical Calibration. Displays the Mechanical Calibration report, listing the 3 leveling
adjusters and the 2 screws that need to be adjusted (in order to
correct the misalignments found in the QC Results Report). An
illustration also displays.
Reset Planes Offset.
Resets the Planes Offset to a predefined value.
Note: After Reset Planes Offset, a Scan Hardware Reset should
be performed.
Reset CT Recon Center.
Resets the CT Recon Center Offsets to 0.0.