GE Discovery LS - Chapter 7 Gantry; Section 7.1 CT-PET Gantry Functional Description; 7.1.1 Mechanical Description; 7.1.2 PET Gantry Field Upgrade Modifications

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DIRECTION 2307224-100, REVISION 6DISCOVERY LS SYSTEM SERVICE MANUAL
Chapter 7 - Gantry Page 223
Chapter 7 - Gantry
For service information and procedures for the CT gantry components: Refer to Chapter 7 -
Gantry in one of the following appropriate manuals:
• LightSpeed 2.X System Service Manual, Direction 2243314-100 (for 4-slice SDAS
Systems)
• LightSpeed 3.X Service Information CD-ROM, Direction 2330551-200 (for 4 and 8-slice
MDAS Systems).
• LightSpeed 4.X Service Information CD-ROM, Direction 2353846-200 (for
16-slice MDAS Systems).
For periodic maintenance procedures for the CT gantry components: Refer to the CT Planned
Maintenance Procedures CD-ROM, Direction 5112972-200.
For service information and procedures for the PET gantry components: Refer to the Advance
PET Imaging System Service Manual, Direction 2100507 and specifically to the enclosed:
• Advance PET Imaging System Repair Procedures, Direction 2100323, Chapter 2 - Gantry.
• Advance PET Imaging System Wiring, Direction 46-322541, Section 4 - Gantry.
For periodic maintenance procedures for the PET gantry components: Refer to PET Advance
Imaging System Planned Maintenance Manual, Direction 2240409-100, Chapter 4 - Gantry and
Table.
For PET gantry FRUs: Refer to the PET Advance NXi System Illustrated Parts List, Direction
2286765-100, Chapter 1, Section 2 - Gantry.
7.1 CT-PET Gantry Functional Description
7.1.1 Mechanical Description
The Discovery LS gantry is built from two main building blocks:
• CT Gantry – LightSpeed Plus (4-slice), LightSpeed Ultra (8-slice), or LightSpeed 16
(16-slice)
• PET Gantry – PET Advance
The electro-mechanical design for the system takes into account the need for a field upgrade path
for the PET Advance (several systems configurations are available in the field) and LightSpeed Plus
installed base, parallel to the installation of new systems that are built and shipped with a Discovery
LS configuration.
In order to keep the design as simple as possible while maintaining the system configuration of the
field-upgraded systems similar to the new systems, a special process for the PET Gantry
modification was developed.
7.1.2 PET Gantry Field Upgrade Modifications
The following changes were introduced in the PET Advance Gantry:
1.) Elimination of the tilt option (old tilting gantries).
2.) Changing the legs of the Gantry (new design).
3.) Removal of the Gantry baseplate.
4.) Installation of a transportation mechanism that allows movement of the PET Gantry to its
service position. (See Section 7.1.2.1.)
5.) A new set of system covers is used. (To remove the covers, see Section 7.6.1.)
6.) New Gantry to Table cable routing using flexible cables and retractors. (See Section 7.1.2.2.)
7.) Mechanical alignment mechanism to enable CT and PET image registration. (See Section
7.1.2.5.)