Rotated Multi-Stage X-Ray Detector for Simpler Energy Readout
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Solution Overview
Problem
Existing radiology image detectors face challenges in maximizing X-ray absorption, spatial and spectral resolution, and energy selectivity while maintaining a compact design, especially when stacking multiple matrix arrays and scintillators, which becomes complex and difficult for portable detectors.
Innovation Solution
A digital detector with superposed conversion stages, each oriented at a distinct angle, allows for easy addressing and reading of multiple matrix arrays and scintillating layers, using a polygonal matrix array configuration with integrated addressing and driving modules on a monolithic substrate, enabling efficient energy separation and improved resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple matrix arrays and scintillators are stacked to improve X-ray absorption and energy selectivity, then energy resolution and absorption efficiency are improved, but device complexity and difficulty of addressing/reading out the arrays increase
Solution Approach 1:
The patent applies dimensional change by rotating subsequent matrix arrays by 45 degrees relative to the previous one in the stack. This angular arrangement in the third dimension (depth) allows addressing and reading operations to be performed from a single side of the detector assembly, rather than requiring access to multiple sides. The rotated configuration enables the address and readout lines to be routed through the same edge, significantly simplifying the interconnection architecture while maintaining multiple conversion stages for improved energy resolution.
Solution Approach 2:
The patent implements multi-functionality by designing a unified addressing and reading system that handles multiple rotated matrix arrays through a single interface structure. The same edge of the assembly serves multiple functions: it provides address lines for row selection, readout lines for column data extraction, and interconnection pathways for multiple rotated layers. This universal interface design eliminates the need for separate addressing mechanisms for each array orientation, reducing overall system complexity despite the increased number of conversion stages.
2Reliability
If multiple conversion stages are superposed to improve X-ray absorption and spectral resolution, then absorption efficiency and spectral selectivity are improved, but the assembly becomes more complex and less suitable for portable detectors
Solution Approach 1:
The patent uses dimensional change by stacking multiple conversion stages along the depth axis with each subsequent stage rotated by 45 degrees. This angular stacking in the third dimension allows the system to achieve high X-ray absorption efficiency through multiple conversion opportunities while maintaining a compact lateral footprint. The rotated arrangement enables all stages to be accessed and addressed from a single side, preventing the assembly from becoming excessively complex or bulky, thus preserving portability.
3Ease of operation
If traditional planar sensor configuration is used, then addressing and reading is straightforward, but X-ray absorption efficiency and spectral resolution are limited
Solution Approach 1:
The patent extends the traditional planar configuration into the third dimension by stacking multiple conversion stages at different angular orientations. This vertical stacking with 45-degree rotations between layers maintains ease of operation because all addressing and reading operations can still be performed from a single side of the assembly. The multi-layer angular structure enables enhanced spectral resolution through multiple conversion opportunities while preserving the operational simplicity of single-side access that characterizes traditional planar sensors.
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 configuration enhances X-ray absorption, spatial and spectral resolution, and energy selectivity, allowing for up to eight energy channels without increasing assembly complexity, while maintaining a compact and portable design, overcoming the limitations of traditional detectors.
Implementation Method 1
incident radiation 19 is converted into a light signal by a scintillator
Implementation Method 2
A pixel P(i,j) comprises a photodiode Dp(i,j) associated with an electronic switch T(i,j)
Data Source
AI summary
A digital detector includes a conversion block intended to convert incident radiation into electric charge; an electronic card that converts the electric charge into a digital image, the conversion block comprising N conversion stages superposed on one another, N being an integer between 2 and M, each of the N conversion stages comprising: a monolithic substrate; a first converter assembly in the form of a polygonal matrix array, M being the number of sides of the polygonal matrix array, M preferably being equal to 4, and configured so as to generate the electric charge on the basis of the incident radiation; an addressing and driving module for addressing and driving the matrix array, the addressing and driving module being arranged on the monolithic substrate along one side of the polygonal matrix array; each of the N conversion stages being oriented by at least 1/M of a turn with respect to the other N−1 conversion stages of the conversion block, and with an orientation distinct from the other N−1 conversion stages of the conversion block.