Photon-Counting Detector Polarization Reduction via Infrared Light
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Solution Overview
Problem
Photon-counting detectors in CT systems face issues with polarization due to interaction depth and high flux, leading to saturation and inaccurate measurement of photon energy, which current solutions have not adequately addressed.
Innovation Solution
The implementation of an external infrared light source is used to stimulate de-trapping of trapped space charges in photon-counting detectors, reducing recovery time and polarization effects by comparing photon counts and leakage currents to predetermined thresholds and applying the light source accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If photon-counting detectors operate at high flux to improve measurement speed and productivity, then productivity is improved, but polarization effects increase causing detector saturation and measurement inaccuracies
Solution Approach 1:
The patent applies preliminary anti-action by using an external infrared light source to actively counteract polarization effects before they cause detector saturation. The infrared light stimulates de-trapping of space charges that cause polarization, thereby preventing measurement inaccuracies before they occur during high-flux operation
Solution Approach 2:
The patent introduces an external infrared light source as an intermediary to mediate between the high-flux X-ray operation and the photon-counting detector. This intermediary infrared stimulation enables the detector to handle high flux rates while maintaining measurement accuracy by preventing charge accumulation that would otherwise cause polarization
2Measurement precision
If external infrared light source is applied to reduce polarization effects, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The external infrared light source serves as an intermediary device that adds minimal complexity while significantly improving measurement precision. The infrared source is a separate, standalone component that stimulates de-trapping of space charges without requiring integration into the core detector structure
Solution Approach 2:
The patent changes the operational parameters of the detector by introducing infrared light stimulation at specific wavelengths that resonate with the trap energy levels in the detector material. This parameter change enables efficient de-trapping of space charges, improving measurement accuracy without requiring fundamental changes to the detector design
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces polarization effects in photon-counting detectors, improving the accuracy of photon energy measurement and maintaining signal-to-noise ratio, thereby enhancing the performance of CT systems.
Implementation Method 1
The implementation of an external infrared light source is used to stimulate de-trapping of trapped space charges in photon-counting detectors
Data Source
AI summary
A computed tomography (CT) image apparatus includes a plurality of photon-counting detectors (PCD); and processing circuitry configured to obtain a photon count of a PCD of the plurality of PCDs, compare the obtained photon count to a predetermined photon-count threshold, and apply an external light source to the PCD when the obtained photon count is larger than the predetermined photon-count threshold.