Tileable Multi-Layer Detector for High Flux CT Imaging
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Solution Overview
Problem
Conventional radiographic detectors for high flux rate imaging, such as in CT systems, suffer from saturation, reduced detection quantum efficiency, and inability to track X-ray photon flux rates, leading to unpredictable detector response and degraded image quality, especially at high flux levels.
Innovation Solution
A detector assembly with multiple layers and interconnect structures is designed to facilitate image data transfer, allowing for photon counting with energy discrimination and minimizing interconnect lengths, which includes a first detector layer with coupling gaps and a second detector layer with larger gaps for efficient data transfer and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional detectors are used for high flux rate imaging, then real-time observation of interior aspects is achieved, but detector saturation and reduced detection quantum efficiency occur at high flux levels
Solution Approach 1:
The detector array is divided into multiple independent detector elements arranged in rows and columns, where each element can be independently controlled and read out. This segmentation allows the system to handle high flux rates by distributing the photon counting load across multiple elements, preventing saturation of individual detectors while maintaining reliable response.
Solution Approach 2:
The patent transitions from conventional integration-based detection to photon counting detection, adding the dimension of discrete photon event detection. This enables the system to track individual photons at high flux rates, providing both quantitative flux measurement and energy discrimination capabilities that overcome the saturation limitations of traditional detectors.
2Measurement precision
If pixel size is reduced to achieve higher spatial resolution and reduce flux rate sensitivity, then spatial resolution is improved, but manufacturing cost increases
Solution Approach 1:
The system employs dynamic range adjustment capabilities where the detector can adapt its response characteristics based on the incident flux level. This allows larger pixels to be used without sacrificing performance, as the detector can dynamically adjust to prevent saturation during high flux conditions, thereby reducing manufacturing costs while maintaining spatial resolution.
Solution Approach 2:
The patent utilizes energy discrimination capabilities to differentiate photons based on their energy levels. By sorting photons into energy bins, the system can effectively reduce the impact of high flux rates on individual pixels, allowing for larger pixel sizes with reduced flux sensitivity while maintaining both spatial resolution and cost-effectiveness.
3Area of stationary object
If the number of detector rows is increased to obtain wider coverage, then detector coverage area is improved, but system complexity and electronics requirements increase
Solution Approach 1:
The detector array is segmented into multiple rows and columns with independent readout circuits for each element. This segmentation allows for scalable expansion of coverage area while managing electronics complexity through modular design, where each detector element has its own simplified readout path.
Solution Approach 2:
The detector elements are designed with multi-functionality, serving both as photon detection sensors and as part of the spatial encoding structure. Each detector element handles multiple tasks including photon counting, energy discrimination, and spatial positioning, reducing the need for separate specialized electronics and thereby lowering overall system complexity despite increased coverage area.
4Reliability
If interconnect lengths are minimized to reduce capacitance effects and improve signal quality, then signal quality is improved, but detector module design complexity increases
Solution Approach 1:
The patent employs a three-dimensional stacked detector architecture where detector elements are arranged in multiple layers along the beam path. This vertical stacking reduces the planar interconnect lengths required to connect detector elements to readout electronics, minimizing capacitance effects and improving signal quality while the layered structure manages the complexity through systematic routing.
Solution Approach 2:
The system introduces intermediate readout circuits and signal conditioning stages that act as mediators between the detector elements and the final processing electronics. These intermediaries buffer and condition signals from multiple detector elements, reducing the direct interconnect length requirements and capacitance effects while organizing the complexity into manageable stages.
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
The solution enables reliable photon counting and energy discrimination at high flux rates, reducing saturation and improving image quality by efficiently transferring and processing data, while minimizing system size and complexity.
Implementation Method 1
Conventional CT and other radiographic imaging systems utilize detectors that convert radiographic energy into current signals
Data Source
AI summary
A detector assembly is presented. The detector assembly includes a first detector layer having a top side and a bottom side, where the first detector layer includes a plurality of first coupling gaps. Additionally, the detector assembly includes a first interconnect structure operationally coupled to the first detector layer and configured to facilitate transfer of a first set of image data from the first detector layer to backplane electronics. The detector assembly also includes a second detector layer having a top side and a bottom side and disposed adjacent the bottom side of the first detector layer, where the second detector layer includes a plurality of second coupling gaps configured to facilitate passage of the first interconnect structure from the first detector layer to the backplane electronics. Also, the detector assembly includes a second interconnect structure operationally coupled to the second detector layer and configured to facilitate transfer of a second set of image data from the second detector layer to the backplane electronics.