Spatially Encoded Crystal Array for 3D Photon Position Detection
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Solution Overview
Problem
Current high-energy photon detectors face limitations in spatial resolution, particularly in obtaining two-dimensional and three-dimensional spatial distribution of photons, due to issues such as limited crystal size and edge effects, which affect detector calibration and imaging quality.
Innovation Solution
A spatial encoding crystal array is introduced, featuring scintillation crystal strips with isolation layers arranged according to a predetermined spatial encoding function, allowing for incomplete optical isolation and preservation of visible-light photon distribution, enabling three-dimensional spatial position information through photoelectric conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer scintillation crystal array structure is used, then the detector can be manufactured with simple structure, but the spatial resolution is limited and two-dimensional spatial distribution cannot be obtained
Solution Approach 1:
The scintillation crystal is divided into multiple strips arranged in array form, with isolation layers positioned between adjacent strips. This segmentation allows the detector to resolve spatial distribution across multiple crystal strips while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent transitions from a single-layer structure to a multi-layer spatial encoding structure by introducing isolation layers at different depth positions. This adds a depth dimension to the spatial encoding, enabling two-dimensional spatial distribution information to be obtained while keeping the manufacturing complexity manageable.
2Reliability
If a continuous scintillation crystal structure is used, then the detector can achieve good optical isolation, but edge effects are serious which limits crystal size and complicates calibration
Solution Approach 1:
The continuous crystal is segmented into multiple strips with isolation layers positioned between them. This segmentation reduces edge effects by creating distinct optical isolation zones while maintaining good optical isolation between adjacent crystal strips, thereby improving calibration performance.
Solution Approach 2:
Isolation layers are selectively positioned between adjacent crystal strips rather than throughout the entire crystal volume. This local application of isolation properties reduces edge effects at critical interfaces while maintaining optical isolation where needed, enabling larger crystal sizes without proportionally increasing calibration difficulty.
3Reliability
If complete optical isolation is implemented between crystal strips, then cross-talk is reduced, but spatial distribution information of photons is lost
Solution Approach 1:
Instead of implementing complete optical isolation, the patent uses partial isolation where isolation layers are positioned at specific depth locations rather than throughout the entire crystal depth. This partial isolation approach reduces cross-talk sufficiently while allowing photons to maintain their spatial distribution information by scattering or reflecting off the isolation layers at controlled positions.
Solution Approach 2:
The isolation layers act as intermediaries between adjacent crystal strips. Rather than providing complete blockage, they serve as partial barriers that reduce cross-talk while still allowing photons to interact with multiple strips, thereby preserving spatial distribution information that can be used for depth encoding.
4Area of stationary object
If crystal size is increased to improve detection coverage, then the detection area is expanded, but edge effects become more serious and calibration becomes more difficult
Solution Approach 1:
The crystal is divided into multiple strips with isolation layers between them, which reduces edge effects even as the overall detector area increases. This segmentation allows larger detection coverage while maintaining manageable calibration complexity through localized isolation zones.
Solution Approach 2:
Isolation properties are applied locally between crystal strips rather than uniformly across the entire crystal. This allows the detector to scale to larger areas while keeping calibration difficulty manageable by concentrating isolation measures at critical interfaces rather than throughout the entire volume.
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 enhances spatial resolution by correlating visible-light photon distribution with deposition depth and projection position, allowing for accurate determination of high-energy photon three-dimensional spatial positions with low cost and simple hardware implementation.
Implementation Method 1
the high-energy photon interacts with scintillation crystals to convert the high-energy photon into visible-light photons
Implementation Method 2
the visible-light photon is incident to photoelectric conversion device coupled to the scintillation crystal. The photoelectric conversion device converts the incident visible-light into an electrical signal
Data Source
AI summary
A spatial encoding crystal array, a spatial encoding detector, a spatial encoding method, a spatial encoding apparatus, and a storage medium are provided. The spatial encoding crystal array comprises: a plurality of scintillation crystal strips (10) and isolation layers (20), wherein the isolation layers (20) are arranged in a depth direction of the scintillation crystal strips (10) and are located between adjacent scintillation crystal strips (10); and the spatial distribution of the isolation layers (20) satisfies a predetermined spatial encoding function, and the properties of the isolation layers (20) conform to predetermined spatial encoding properties. The isolation layers (20) for spatial encoding are formed in different areas between the scintillation crystal strips (10), so as to form incomplete optical isolation, thereby saving on spatial distribution information of visible-light photons, and accurately obtaining three-dimensional spatial position information of high-energy photons.