Radiation Image Detector Light Collection and Shielding
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Solution Overview
Problem
Existing indirect conversion type radiation image detectors suffer from low spatial resolution and contrast due to light deviation and crosstalk, affecting image quality, and existing solutions like non-crystal scintillators and fiber optical plates have limitations in stability and manufacturing complexity.
Innovation Solution
A radiation image detector design featuring a substrate with a radiation conversion layer, an optical image detector array, a light-shielding structure, and a light-collecting structure with convex lenses that collimate visible light, allowing only small-angle light to reach photosensitive pixels, thereby reducing crosstalk and improving image resolution and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a radiation conversion layer is used to convert radiation into visible light, then radiation detection is enabled, but light deviation occurs causing position error and image quality degradation
Solution Approach 1:
The patent divides the optical path into multiple controlled segments: the radiation conversion layer is segmented into pixel-corresponding regions, light-shielding structures are segmented to match pixel positions, and light-collecting structures are segmented to guide light from specific regions. This segmentation ensures that light from each pixel position is precisely directed to the corresponding photosensitive element, preventing position errors and maintaining spatial resolution.
Solution Approach 2:
The patent introduces intermediary structures between the radiation conversion layer and the photosensitive pixels: light-shielding structures that block stray light and light-collecting structures that guide useful light. These intermediaries act as mediators that correct light paths and ensure accurate position mapping, resolving the position accuracy issue while preserving detection capability.
2Reliability
If light is allowed to reach photosensitive pixels without restriction, then detection efficiency is improved, but large-angle light causes position deviation and crosstalk
Solution Approach 1:
The patent applies local quality control by positioning light-shielding structures at specific locations to block large-angle light from adjacent pixels, while light-collecting structures are positioned to capture and guide light from specific regions. This localized control ensures that each photosensitive pixel receives light only from its corresponding region, eliminating crosstalk while maintaining high detection efficiency and image quality.
3Measurement precision
If conventional light collection methods are used, then device complexity is reduced, but spatial resolution and contrast are insufficient
Solution Approach 1:
The patent merges multiple functions into integrated structures: the light-shielding structures and light-collecting structures are designed to work together as a unified optical control system, with the light-collecting structures positioned to complement the light-shielding patterns. This merging achieves high spatial resolution and contrast while minimizing the number of separate components, thus controlling device complexity.
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 design enhances image resolution and detective quantum efficiency, particularly at high spatial frequencies, while maintaining balance between low and high spatial frequency performance, and is applicable to various scintillator types, improving image detection capabilities.
Implementation Method 1
a radiation conversion layer configured to convert radiation into visible light
Implementation Method 2
a light-collecting structure located between the radiation conversion layer and the light-shielding structure and comprising a plurality of convex lenses
Implementation Method 3
After the visible light is received by the photoelectric conversion device, electron-hole pairs are generated
Data Source
AI summary
Provided is a radiation image detector, including: a substrate; a continued radiation conversion layer configured to convert radiation into visible light; an optical image detector on the substrate and between the radiation conversion layer and the substrate, wherein the optical image detector comprises an array of photosensitive pixels; a light-shielding structure located on a side of the plurality of photosensitive pixels facing away from the substrate, wherein the light-shielding structure has a plurality of openings to allow the visible light to reach the photosensitive pixels; and a light-collecting structure located between the radiation conversion layer and the light-shielding structure and comprising a plurality of convex lenses, wherein each convex lens has its optical axis perpendicular to the light-shielding structure and passing through one of the plurality of openings.