Non-Uniform SPECT Collimator Layout for Resolution and Sensitivity
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Solution Overview
Problem
Existing radiation-based imaging systems face a tradeoff between imaging resolution and signal sensitivity due to conventional collimator and detector designs, with parallel-hole collimators attached tightly to detectors, limiting photon paths and compromising performance.
Innovation Solution
A collimator design with non-uniformly distributed apertures is deployed at a distance from the detector, allowing overlapping illumination of detector areas by multiple apertures, and incorporating repetitive patterns to enhance imaging resolution without sacrificing signal sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional parallel-hole collimator is attached tightly to the detector, then the device structure is simple and easy to manufacture, but the imaging resolution deteriorates and signal sensitivity is compromised
Solution Approach 1:
The collimator is separated from the detector, creating independent components that can be optimized separately. The collimator with non-uniformly distributed apertures is positioned at a distance from the detector surface, allowing each component to be designed and manufactured independently while achieving superior imaging performance through their coordinated spatial arrangement
Solution Approach 2:
The patent introduces a new spatial dimension by positioning the collimator at a distance from the detector rather than attaching it directly. This dimensional change allows photons to travel through multiple apertures and illuminate overlapping areas on the detector, creating a more complex but higher-resolution imaging geometry
2Device complexity
If a conventional parallel-hole collimator is attached tightly to the detector, then the device structure is simple, but the signal sensitivity deteriorates
Solution Approach 1:
By segmenting the collimator-detector system into separate components with optimized spacing, the design enables increased photon acceptance angles and overlapping illumination patterns that improve signal sensitivity without requiring a direct attachment configuration
Solution Approach 2:
The patent changes the spatial parameter by introducing a specific distance range between the collimator and detector (0.5 to 10 times the collimator thickness). This parameter optimization allows for improved photon transmission and detection sensitivity while maintaining manageable device complexity
3Measurement precision
If a collimator with non-uniformly distributed apertures is spaced from the detector, then the imaging resolution is improved, but the device complexity increases
Solution Approach 1:
The collimator features non-uniformly distributed apertures with varying sizes, shapes, and densities across different regions. This local quality variation optimizes imaging resolution for different spatial frequencies and anatomical structures, with the complexity justified by the performance gains in critical imaging regions
4Measurement precision
If the collimator is spaced from the detector allowing overlapping illumination, then the imaging resolution is improved, but the computation complexity increases
Solution Approach 1:
The system performs preliminary characterization of the collimator-detector geometry and aperture distribution to pre-calculate system matrices and reconstruction parameters. This preliminary action simplifies the actual image reconstruction process by preparing lookup tables and calibration data that account for the overlapping illumination patterns before clinical imaging begins
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 new collimator design improves imaging resolution and reduces computation complexity while maintaining signal sensitivity, enabling effective image reconstruction and reduced cross-talk.
Implementation Method 1
a collimator configured to filter radiation emitted from a target object, the collimator including a plurality of apertures non-uniformly distributed on the collimator
Implementation Method 2
a detector for detecting the radiation that has passed through the collimator
Data Source
Figure 1A
Figure 1B~1C
Figure 2A~2B
AI summary
A radiation-based imaging system includes a collimator configured to filter radiation emitted from a target object, the collimator including a plurality of apertures non-uniformly distributed on the collimator. A largest acceptance angle of the plurality of apertures is not larger than 15°. The radiation-based imaging system further includes a detector for detecting the radiation that has passed through the collimator. The collimator is spaced from the detector such that a point on a top surface of the detector that faces the collimator is simultaneously illuminated by two or more of the plurality of apertures.