GE Discovery LS - Section 3.5 Patient Table; Section 3.6 PET Service Access; Section 3.7 CT-PET LAN (Local Area Network)

GE HEALTHCARE
DIRECTION 2307224-100, REVISION 6DISCOVERY LS SYSTEM SERVICE MANUAL
Chapter 3 - DLS System Functional Description Page 83
3.5 Patient Table
The Patient Table is a common CT-PET subsystem used for both acquisition procedures. The
Patient Table positions the patient in the imager’s Field Of View (FOV). The Patient Table moves
in the horizontal and vertical axes for patient positions. These movements are standard in both
regular CT and PET acquisitions procedures.
A new axis was added, moving all the table base from CT FOV position to PET FOV position. In the
first stage of the combined CT-PET acquisition, the table base is positioned in the CT position and
a standard CT acquisition is performed on a specific part of the patient’s body. In the second stage,
the table base is moved to the PET position to start PET acquisition. The distance from CT to PET
is equal to the distance from CT FOV to PET FOV. Moving the base allows performance of the two
acquisitions maintaining the same position of the cradle’s horizontal axis. The cradle sagging is
equal in both CT and PET FOV, which eliminates its impact in the CT and PET images registration.
Figure 3-2: Patient Table
The patient table also includes the electronics that control the Gantry side Operator Control Panel
and Gantry Display (Panel/Display CAN bus).
3.6 PET Service Access
The PET gantry is mounted on rollers and a drive system is employed to move it away from the CT
gantry and provide at least 700 mm clearance for service access between the two gantries.
3.7 CT-PET LAN (Local Area Network)
The Discovery LS LAN is a common CT-PET network that integrates both the CT and the PET
original LAN networks. It carries data and commands between all of the subsystems: OWS PET,
WS CT, Table, Gantry CT, Gantry PET, SHARC and EDCAT. The network type is standard
Ethernet, and transmits data at 10 megabits per second.
• Figure 3-3 shows the original CT and PET network circuits.
• Figure 3-4 and Figure 3-5 show two options of integrated CT and PET networks circuits.
The PET OWS and Xeleris Processing Station are connected to the LAN network through
free Ports 4 and 5 of the existing LAN switch inside the CT console. In some sites a
second network, the hospital’s DICOM network, may be connected to the CT-PET WS for
full interconnectivity between the hospital’s computer and the CT-PET imager. This
connection is done through an additional hub/switch that has the same part number as the
internal CT console switch. The additional switch, as well the connection cabling (RJ-45)
are GE supplied.
PET
CT
PET
CT
Long Cradle
Cradle Extension
Secondary Base
Long Cradle
Cradle Extension
Secondary Base