GE Discovery LS - Section 3.3 PET Overview and Functionality

GE HEALTHCARE
DIRECTION 2307224-100, REVISION 6DISCOVERY LS SYSTEM SERVICE MANUAL
Chapter 3 - DLS System Functional Description Page 81
3.2.7 Slip-Ring Infrastructure
The slip-ring infrastructure consists of the following architecture:
• 4 CU Rings for STC/OBC Communications
• 2 RF Rings for DAS data transfer
• 3 CU Rings for Safety Interlock
• 5 CU Rings for Power (HVDC+, HVDC-, 120 VAC-L1, 120 VAC-L2)
• Safety Ground
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.
3.3 PET Overview and Functionality
The Advance PET imaging system comprises four major subsystems:
• Operator Workstation (Console)
• Electronics Cabinet
•Gantry
• Common CT-PET Patient Table (See Figure 3-10.)
3.3.1 Electronic Cabinet
The Electronic Cabinet takes detector signals from the Gantry, processes and transforms them, and
transmits them to the workstation. The cabinet houses the chassis for two separate subsystems,
the MAGIC and SHARC.
3.3.1.1 MAGIC
MAGIC is a large part of the EDCAT (Event Detection, Coincidence And Timing) subsystem, and
processes the event digital data produces by the detector electronics in the GANTRY. MAGIC is an
acronym for Modular Address Generator Into Coincidence and transmits coincidence event location
to the SHARC.
3.3.1.2 SHARC
The SHARC (Sorter Histogrammer Acquisition Reconstruction Controller) processes the
coincidence data, transforms into sinogram format, further transforms the sinogram into images and
transmits the transformed and processed data to the workstation.
3.3.1.3 PDU
In addition to the two subsystems described above, the electronics cabinet houses a Power
Distribution Unit (PDU) for power generation to the Gantry and a DC power supply for the MAGIC
and SHARC.
3.3.2 Gantry
The Gantry contains:
• Detector Ring
• Detector Electronics (REDDOG)
• Control Board Rack
• Power Control Unit
• Source/Collimator Drive Electromechanical Mechanism