3D Radiation Detection for Multiplexed Collimator Imaging
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Solution Overview
Problem
Current nuclear medicine imaging techniques face challenges in resolving low-level radiation signals while minimizing radiation dose and maintaining image resolution, particularly due to multiplexing effects from multi-apertured collimators, which result in image artefacts and require higher radiation doses.
Innovation Solution
A method and system using a collimator with overlapping apertures and a detector capable of three-dimensional interaction localization, processing position and depth data to accommodate multiplexing effects, allowing for improved image reconstruction and reduced radiation dose.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a multi-apertured collimator is used to improve detection sensitivity, then more radiation signals are detected, but multiplexing effects cause image artefacts and reduce measurement precision
Solution Approach 1:
The patent applies depth of interaction (DOI) measurement to add a third dimension to the detection process. By measuring not only the position but also the depth at which radiation interacts with the detector, the system can distinguish between overlapping signals from different apertures, thereby resolving multiplexing artefacts while maintaining high detection sensitivity
Solution Approach 2:
The patent changes the parameter set used for image reconstruction by incorporating depth of interaction information alongside position data. This additional parameter allows the reconstruction algorithm to accommodate multiplexing effects and produce artefact-free images from multi-apertured collimator data
2Measurement precision
If rigid collimation is used to reduce multiplexing effects, then image artefacts are reduced, but detection sensitivity decreases and radiation dose must be increased
Solution Approach 1:
The patent introduces depth of interaction measurement as an intermediary parameter that mediates between the conflicting requirements of using multi-apertured collimators for sensitivity while avoiding multiplexing artefacts. This intermediary information enables the system to achieve both goals simultaneously
3Measurement precision
If radiation dose is increased to improve signal resolution, then low-level signals are detected more accurately, but patient exposure to harmful radiation increases
Solution Approach 1:
The patent uses depth of interaction information as feedback to improve the accuracy of signal attribution to specific apertures. This feedback mechanism allows the system to achieve better signal resolution without increasing radiation dose, as the DOI data enables more accurate reconstruction from lower-level signals
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
Enables effective resolution of low-level radiation signals with reduced radiation dose by mitigating multiplexing effects through depth of interaction data processing, resulting in higher quality images without the need for rigid collimation and pixelation.
Implementation Method 1
A radiation detection system for the detection of radiation from a source... receiving a plurality of responses each being a response to an interaction with incident radiation occurring within the detector
Data Source
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AI summary
A method of processing radiation from a source is described comprising: positioning a detector to receive radiation from the source; positioning a collimator between the source and the detector, wherein the collimator has a plurality of apertures; allowing radiation from the source to pass through the collimator and be incident upon the detector; receiving a plurality of responses each being a response to an interaction with incident radiation occurring within the detector; determining, for each of the plurality of responses, a characteristic of the interaction, wherein the characteristic comprises at least a position and depth of the interaction within the detector; processing the said plurality of responses by simultaneously processing position and depth of interaction data in such manner as to accommodate the effect of multiplexing due to overlap of the projected radiation pathways from multiple apertures in the collimator at the detector on the detected position on the detector. A radiation detection system for the detection of radiation from a source, in particular to perform the method, is also described.