Radiation Detector Scheduling Architecture for Digital Noise Reduction
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Solution Overview
Problem
Radiation detectors, particularly pixelated detectors like Cadmium Zinc Telluride (CZT), face interference from digital noise and crosstalk signals, leading to false hits and image artifacts, which degrade image quality and detector sensitivity.
Innovation Solution
A scheduling architecture for radiation detector systems that generates control signals without a clock, using shaper timers and processors to control data acquisition and processing, thereby minimizing interference and distinguishing true from false signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If digital communication links are used within the system, then control signals can be transmitted, but digital noise is generated that interferes with detector signals
Solution Approach 1:
The system separates control signal generation from detector signal processing by using independent clock domains. The control logic operates on a first clock while detector signals are processed on a second clock, segmenting the digital system to prevent noise coupling between control and detection functions.
Solution Approach 2:
A dedicated control signal path acts as an intermediary between the control logic and detector operations. This separate pathway transmits control signals without introducing digital switching noise into the sensitive detector signal chains, mediating between control requirements and detection sensitivity.
2Productivity
If signal processing is performed continuously, then system productivity is maintained, but transient crosstalk signals affect subsequent analysis
Solution Approach 1:
The system performs preliminary discrimination of transient crosstalk signals using timing information before they corrupt the spectral analysis. By identifying and flagging crosstalk events in real-time based on their characteristic timing patterns, the system prevents these false signals from being incorporated into the final spectral measurement.
Solution Approach 2:
The system uses feedback from timing analysis to adjust signal acceptance decisions. When transient crosstalk is detected through timing discrimination, the system provides feedback to reject those specific signals, maintaining measurement precision while allowing continuous processing of valid signals.
3Measurement precision
If clock signals are used for synchronization, then timing precision is improved, but digital activity noise increases
Solution Approach 1:
The system segments the clocking architecture into separate clock domains for control functions and detector signal processing. This segmentation allows precise timing synchronization within each domain while preventing the digital switching noise from one domain from coupling into the other, particularly protecting the sensitive detector channels.
Solution Approach 2:
The patent introduces intermediary timing mechanisms that translate between different clock domains without requiring a single high-frequency clock throughout the system. This intermediary approach maintains timing precision across subsystems while using lower-frequency clocking that generates less digital noise.
4Productivity
If false hits are recorded during detection, then count rate increases, but image artifacts are introduced
Solution Approach 1:
The system performs preliminary identification and rejection of false hits caused by transient crosstalk before they are incorporated into the final image reconstruction. By using timing information to distinguish true photon events from crosstalk-induced false hits, the system maintains accurate photon counts without introducing image artifacts.
Solution Approach 2:
The system implements feedback mechanisms that monitor detection events in real-time and dynamically adjust signal acceptance criteria. When transient crosstalk patterns are detected, feedback loops adjust the decision threshold or timing windows to reject false hits, preserving image quality while maintaining maximum acceptance of true photon events.
Data Source
AI summary
Systems and methods for generating control signal in radiation detector systems are provided. One system includes a scheduling architecture having at least one anode channel connected to a detector of the radiation detector system. The anode channel includes a charge sensitive amplifier and a signal shaper, wherein the anode channel is configured to generate at least one control signal to control data acquisition by the detector. The scheduling architecture also includes at least one shaper timer configured having a time constant to define timing for the generation of the control signal without using a clock.