GE HEALTHCARE
DIRECTION 2307224-100, REVISION 6DISCOVERY LS SYSTEM SERVICE MANUAL
Page 80 Chapter 3 - DLS System Functional Description
3.2.1 PDU
CT Systems used with the DLS may have either a Compact PDU (CPDU) or the shorter New Global
PDU (NGPDU). Refer to Figure 3-9. The PDU distributes system power. Power travels from the
PDU to the Gantry. The HV (High Voltage) generator produces high voltage and transmits it over
the slip-rings to the x-ray tube.
3.2.2 Data Acquisition System
The scintillation material in the Detector (shown in Figure 3-10) absorbs the x-rays that pass
through the patient, and generates a corresponding level of light. The Detector converts the light
into a corresponding electric current. The DAS (Data Acquisition System) samples each detector
cell, amplifies and quantifies the existing current and then sends the resulting data (through a high-
speed slip-ring) to the SRU for patient image generator.
3.2.3 Image Processor
The patient images are recording by the IP (Image Processor) in the CT Host for conversion into
television shades of gray displayed in the CRT monitor. In order to reduce dose and still avoid
artifacts, a Collimator is used to track and follow the focal spot, keeping a uniform x-ray of the
narrowest possible beam on the detector.
3.2.4 Stationary Computer and Axial Board
The functions of the STC (STationary Computer) and the Axial Board are:
• LAN Communication
• Scan Start/Stop Control
• Operator Hard Key Monitor
• Auto Voice Control
• X-Ray Light Control
• DAS Trigger Generation
• Gantry Axial Speed and Position Control
• Slip-Ring Communication to Rotating Gantry
3.2.5 On-Board Controller
The functions of the OBC (On-Board Controller) are:
• X-ray generator control
• Collimator control
• DAS control
3.2.6 Axial Drive
The hardware involved in the Axial Drive servo drive consists of:
• Axial Control Board
• Axial Servo Amp
• Axial Drive Motor
• Axial Motor Brake
• Axial gantry encoder
• Axial Drive Belt and Home Flag
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