X-ray Detector Fault Checker Idle Noise Analysis
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Solution Overview
Problem
X-ray imaging systems, such as CT scanners, face issues with faulty detector channels over time, leading to artifacts in image reconstruction if faulty data is used.
Innovation Solution
A fault checker system for X-ray detectors that includes an input interface for receiving readings from a target pixel not exposed to X-radiation, a converter to normalize these readings, and a thresholder to compare the normalized readings against thresholds to indicate if the detector pixel is faulty.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional fault detection methods using external X-ray signals are used, then faulty detector pixels can be identified, but the imager requires shutdown and external equipment, increasing downtime and complexity
Solution Approach 1:
The detector system performs self-diagnosis by using its own internal noise signals during normal operation to detect faulty pixels, eliminating the need for external test equipment and shutdown procedures. The readout circuitry continuously monitors noise characteristics of each pixel channel and automatically identifies defects without requiring imager downtime.
Solution Approach 2:
The patent extracts and analyzes the noise component from the detector signal during normal operation. By separating the noise characteristic from the useful X-ray signal and monitoring it independently, the system can detect faulty pixels without requiring external test signals or shutting down the imager.
2Reliability
If continuous monitoring of all detector pixels is performed, then faulty pixels can be detected in real-time, but the system complexity and processing requirements increase
Solution Approach 1:
The readout circuitry serves dual functions: it processes useful X-ray detection signals and simultaneously monitors noise characteristics for fault detection. This multi-functionality eliminates the need for separate dedicated test circuitry, reducing overall system complexity while enabling continuous fault monitoring during normal operation.
Solution Approach 2:
The system implements continuous feedback monitoring of noise characteristics from each pixel channel. The readout circuitry constantly measures noise levels and compares them against reference values, providing real-time feedback on pixel health without requiring additional hardware complexity or interrupting normal detector operation.
Data Source
AI summary
A fault checker system for an X-ray detector, comprising an input interface (IN) for receiving readings acquired by a target detector pixel not exposed to X-radiation. A converter (CV) is configured to convert the readings into a metric. A thresholder (CP) is configured to compare the metric against at least one threshold and, based on the comparing, provide an indication on whether the detector pixel is faulty.