Gamma Ray Imaging Device Using Layered Detectors for Directional Resolution
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Solution Overview
Problem
Traditional gamma radiation imaging devices suffer from low detection efficiency due to absorption collimation, which results in poor image quality, especially when imaging wide and continuous radioactive distributions, while coded aperture collimators improve efficiency but reduce directional information.
Innovation Solution
The use of multiple separate detectors with varying thicknesses, materials, and numbers arranged in layers to act as both detectors and collimators, allowing photons to pass through different sets of detectors with different attenuation ratios, enhancing detection efficiency and directional information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional absorption collimator made of heavy metals is used, then spatial resolution is improved, but detection efficiency deteriorates due to photon absorption
Solution Approach 1:
The collimator is divided into multiple independent detector units arranged in different spatial positions and orientations. Each detector unit independently detects photons from specific directions, collectively achieving collimation functionality while improving detection efficiency through parallel detection channels.
Solution Approach 2:
The detector units serve dual functions: they act as both detection elements and collimation elements. Each detector unit not only detects photons but also functions as a collimator for other detector units, eliminating the need for a separate traditional collimator structure and reducing photon absorption losses.
2Productivity
If a coded aperture collimator with high aperture ratio is used, then detection efficiency is improved, but directional information is reduced
Solution Approach 1:
The system transitions from a single-plane coded aperture to a three-dimensional arrangement of multiple detector units at different positions and orientations. This spatial dimensionality addition enables simultaneous detection of photons from multiple directions, preserving directional information while maintaining high detection efficiency through the multi-dimensional detection geometry.
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 approach improves both the detection efficiency and image quality by reducing photon absorption and increasing directional information, enabling better imaging of complex radioactive distributions.
Implementation Method 1
the different detector units made of detector materials with different attenuation ratios to photons, the different detector units located in the front along the movement direction of the photons may block and collimate different photons
Data Source
AI summary
The present disclosure provides a gamma ray imaging device and an imaging method, where the imaging device includes a plurality of separate detectors. The plurality of separate detectors are provided at an appropriate spatial position, in an appropriate arrangement manner and are of an appropriate detector material, such that when rays emitted from different positions in an imaging area reach at least one of the plurality of separate detectors, at least one of the thicknesses of the detectors, the materials of the detectors, and the numbers of the detectors though which the rays pass are different, thereby achieving the effect of determining the directions of rays.