X-Ray Coincidence Detection for Photon-Counting Spectral Imaging
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Solution Overview
Problem
Existing x-ray imaging systems and detectors face challenges in improving signal-to-noise ratio and spectral performance, particularly in photon-counting detectors, and there is a need to enhance the ability to determine information about incident radiation.
Innovation Solution
A photon-counting x-ray detector system with a coincidence detection system that utilizes timing information and the location of the x-ray source relative to the detector, employing a photon scattering model to determine the number, spatial distribution, and energy distribution of incident photons, and incorporates a photon-counting multi-bin detector to discriminate between different photon interaction energies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a photon-counting x-ray detector is used to detect x-ray radiation, then the ability to count individual photons and obtain spectral information is improved, but the signal-to-noise ratio and measurement precision deteriorate due to difficulties in distinguishing scattered photons from primary photons
Solution Approach 1:
The patent introduces an intermediary system (coincidence detection system) that uses timing information and spatial relationships as mediators to distinguish primary photons from scattered photons. The system uses the known x-ray source position and detector geometry as intermediary references to determine whether detected photons are primary or scattered, thereby improving signal-to-noise ratio while maintaining spectral measurement precision
Solution Approach 2:
The patent applies preliminary action by pre-storing timing information from photon interactions and pre-determining the spatial relationship between the x-ray source and detector before actual coincidence detection occurs. This preliminary preparation enables rapid and accurate discrimination between primary and scattered photons during detection, improving both signal-to-noise ratio and measurement precision
2Measurement precision
If coincidence detection with timing information is implemented, then the ability to distinguish primary photons from scattered photons is improved, but the device complexity increases
Solution Approach 1:
The patent segments the detection process into distinct functional modules: a photon-counting detector module for detecting photons, a timing information storage module for recording interaction times, and a coincidence detection module for analyzing the stored data. This segmentation allows each module to perform its specific function efficiently while keeping the overall system complexity manageable through modular design
Solution Approach 2:
The system uses self-service by leveraging the inherent timing information naturally produced during photon detection and the pre-existing spatial relationship between the x-ray source and detector. Rather than requiring additional complex external systems, the detector system utilizes its own operational data (timing information from photon interactions) and fixed geometric configuration to perform coincidence detection and photon discrimination
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
Significantly improves the signal-to-noise ratio and spectral performance of x-ray detectors, enabling better image quality and radiation dose reduction by accurately determining radiation characteristics.
Implementation Method 1
a photon-counting x-ray detector for detecting x-ray radiation
Implementation Method 2
employing a photon scattering model to determine the number, spatial distribution, and energy distribution of incident photons
Data Source
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AI summary
There is provided an x-ray detector system (5) comprising a photon-counting x-ray detector (20) for detecting x-ray radiation from an x-ray source, and a coincidence detection system (60) configured to determine and/or obtain information about the radiation incident on the x-ray detector based on information about the time of photon interactions in said x-ray detector and information about the location of the x-ray source in relation to the x-ray detector. There is also provide an x-ray imaging system comprising such an x-ray detector system, as well as a corresponding coincidence detection system and a corresponding method.