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GE 0621L0461-G002
Product Name: GE Healthcare CT Scanner Data Acquisition System (DAS) Board
Product Overview: According to available supplier documentation, the 0621L0461-G002 is a Data Acquisition System (DAS) board used in GE Healthcare CT scanners. It performs high-speed analog-to-digital conversion and pre-processing of signals received from the detector array. (Note: The “0621L” prefix is also associated with GE Fanuc input modules; confirm applicability with CT scanner model and service documentation.)
Detailed content
Technical Specifications:
- Applicable Models: GE Revolution CT, Revolution ACT, APEX CT, Discovery CT750 HD
- Channels: 64–128 channels per board (configuration-dependent)
- Sampling Rate: ≥ 20 MSPS
- A/D Resolution: 24-bit
- Input Signal: Detector photodiode current signals
- Data Interface: High-speed LVDS / fiber optic interface to reconstruction computer
- Operating Temperature: 20–35 °C (within CT gantry enclosure)
Material Composition: 8–12 layer HDI PCB (FR-4 high-Tg); 24-bit Σ-Δ ADCs; Xilinx/Altera FPGA; Samtec or equivalent high-density board-to-board connectors; aluminum heat sink with forced-air cooling.
Functional Features: High-speed parallel acquisition for sub-millimeter spatial resolution; built-in gain correction and dark-current compensation; supports dual-energy spectral CT acquisition; real-time self-test with automatic channel-fault flagging.
Working Principle: X-ray photons are converted to electrical current by the detector. The DAS board amplifies the current via a front-end amplifier, digitizes it via 24-bit ADC, then buffers, corrects, and packets the data via FPGA before transmitting it over LVDS/fiber to the CT reconstruction computer.
Application Scenarios: Core data-acquisition component in GE Healthcare CT imaging systems.
Installation Requirements: Installation and service must be performed by qualified GE Healthcare service personnel. The board resides in the CT gantry’s DAS electronics compartment under controlled temperature and EMI conditions.
Usage Notes: Sensitive to ESD — always use proper anti-static handling. Do not power the board outside its designated gantry enclosure. Channel calibration must be re-run after any DAS board replacement.
