GE HEALTHCARE
DIRECTION 2307224-100, REVISION 6DISCOVERY LS SYSTEM SERVICE MANUAL
Page 226 Chapter 7 - Gantry
The calibration process involves scanning a special calibration phantom, and uses a specific
calibration procedure in the AWS. This procedure is described in detail in Section 8.1.1. The
adjustment procedure is designed to enable repeatability and accuracy, so that moving the PET to
service position and back does not change the Gantry’s calibration.
7.1.3 Electrical Description
The CT and PET gantries operate as sub-systems of the overall Discovery LS system and are
connected through the system Ethernet LAN. The functionality of each gantry subsystem remains
the same as in stand-alone PET Advance and CT LightSpeed installations.
• Each gantry’s power is supplied separately from its CT and PET PDU (Power Distribution
Unit) subsystem. Both Gantries have a common Ground.
• The PET Gantry panels are not assembled. The Large Display still needs to be connected
to the cabling for software compatibility, but it is not assembled to the system front panel.
The unit just lies at the left side of the PET Gantry, under the left leg.
• The E-Stop pushbuttons for the PET Front Cover are not assembled. Specific cabling was
added/changed to the original wiring in order to bypass these emergency switches.
• Both PET and CT E-Stop hardware circuitries are integrated into a common circuit that
operates with the same functionality as the original separate safety nets. The connection is
implemented through a free relay in the CT Gantry.
• The PET Source indicators are installed on the CT Front Cover. Specific cabling transfers
the signals from the PET Gantry to the CT Front Cover.
• The PET Alignment lights hardware is not assembled. The Discovery LS System uses CT
Alignment hardware to set patient positioning for combined CT-PET scanning.
• The PET Gantry input cables are arranged inside two retractors at the rear of the Gantry.
The purpose of the retractors is to protect and guide the cabling when the PET Gantry
moves away from the CT Gantry for servicing.
• The cabling between both gantries carries the following signals:
*E-Stop
* Source Indicators
* LAN Network
*Ground
7.2 CT Gantry Field Replaceable Units (FRUs)
For field replacement units for the LightSpeed CT gantry components: Refer to one of the
following appropriate manuals:
• LightSpeed 2.X Illustrated Parts List, Direction 2243316-100 (for 4-slice SDAS Systems)
• LightSpeed 3.X Illustrated Parts List, Direction 2296442-100 (for 4 or 8-slice MDAS
Systems)
• LightSpeed 4.X Illustrated Parts List, Direction 2341961-100 (for 16-sice MDAS Systems)
7.3 CT Gantry Replacement Procedures
For replacement procedures for the LightSpeed CT gantry components: Refer to the manuals
listed at the beginning of this chapter on page 223.
7.4 PET Gantry Field Replaceable Units (FRUs)
For field replacement units for the LightSpeed CT gantry components: Refer to the Advance
PET Imaging Renewal Parts Manual, Direction 2286765-100.
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