Dual-Scintillator X-Ray Imager Layout for High Resolution
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Solution Overview
Problem
Current x-ray imagers, particularly high DQE detectors and diagnostic imagers, face challenges in achieving high spatial resolution and efficient x-ray conversion due to high manufacturing costs and optical blurring issues associated with pixelated geometries and thick scintillators, leading to low x-ray conversion efficiency and significant manufacturing expenses.
Innovation Solution
The implementation of an imaging device with a first and second scintillator layer configuration, where the array of detector elements is located between the two scintillator layers, and electrodes or neutral density filters are used to optimize light transmission and signal generation, allowing for improved signal-to-noise ratio and reduced manufacturing costs by using non-pixelated scintillators and minimizing light attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If thick pixelated scintillator arrays are used to improve x-ray conversion efficiency, then more x-ray photons can be detected, but manufacturing costs increase significantly due to the complex process of cutting crystalline scintillators into parallelepipeds and gluing reflective septa between them
Solution Approach 1:
The scintillator is divided into multiple pixel elements arranged in an array, with each pixel being a separate component. This segmentation allows for simplified manufacturing of individual pixels while maintaining high x-ray conversion efficiency through the collective array structure, eliminating the need for complex cutting and gluing processes required for thick monolithic scintillators
Solution Approach 2:
Reflective septa are introduced as intermediary elements between adjacent scintillator pixels. These thin reflective barriers prevent optical cross-talk between neighboring pixels while being much simpler to implement than the complex gluing processes required for thick pixelated arrays, thus reducing manufacturing costs while maintaining detection efficiency
2Measurement precision
If pixelated geometry with reflective septa is used to minimize optical blurring and improve spatial resolution, then image resolution improves, but manufacturing costs increase and fill factor is reduced
Solution Approach 1:
The reflective septa are strategically placed only at the boundaries between pixels where optical cross-talk would occur, rather than throughout the entire scintillator structure. This localized approach provides the necessary spatial resolution control while minimizing material usage and manufacturing complexity, reducing costs compared to comprehensive pixelation schemes
Solution Approach 2:
The reflective septa are implemented as thin film structures rather than thick physical barriers. These thin reflective layers effectively confine optical photons within each pixel while occupying minimal space, thereby maintaining high fill factor and avoiding the cost penalties associated with thick septa structures
3Loss of energy
If thicker scintillator is used to improve x-ray detection efficiency, then more x-ray photons are converted, but optical blurring increases and manufacturing becomes more expensive
Solution Approach 1:
The thick scintillator volume is segmented into multiple smaller pixel elements arranged in an array. This segmentation allows the total detection thickness to be maintained for high x-ray photon efficiency, while each individual pixel remains small enough to minimize optical blurring and maintain manufacturing feasibility without complex gluing processes
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 conversion efficiency, reduces manufacturing costs, and minimizes optical blurring, resulting in improved image resolution and signal quality while maintaining cost-effectiveness.
Implementation Method 1
Incoming x-ray photons deposit energy into the scintillators which then produce optical photons via luminescence
Implementation Method 2
These optical photons, which originate with random polarizations and direction vectors after the luminescence events, are transported throughout the scintillator during which time they can be reflected, refracted and scattered. Eventually, many photons will cross the boundary between the scintillator and the photodiode array to be absorbed by the EPID's photodiodes and converted into electrical current
Data Source
Figure 1
Figure 2~4
Figure 5A~6
AI summary
An imaging device (200), comprising: a first scintillator layer (202); an array of detector elements (204), wherein the array of detector elements (204) comprises a first detector element (204); and a second scintillator layer (206) configured to receive radiation after the radiation has passed through the first scintillator layer (202) and the array of detector elements (204), wherein the array of detector elements (204) is located between the first scintillator layer (202) and the second scintillator layer (206); wherein the first detector element (204) is configured to generate a first electrical signal in response to light from the first scintillator layer (202), and to generate a second electrical signal in response to light from the second scintillator layer (206); and wherein the imaging device (200) further comprises: a first neutral density filter located between the first scintillator layer (202) and the first detector element (204) and/or a second neutral density filter located between the second scintillator layer (206) and the first detector element (204).