3D SPECT Detector Direction Estimation Without Heavy Shielding
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Solution Overview
Problem
Existing SPECT systems rely on shielding to prevent interference from undesired radiation sources, which adds cost, weight, and bulk, and may block desired signals when the source location is unknown or not mechanically linked to the detector gantry.
Innovation Solution
A 3D spectroscopic detector is used to localize the point of interaction and determine the direction of radioactive emissions without shielding, utilizing different thickness profiles or material types on detector sides to distinguish desired from undesired signals, allowing for directional estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If shielding is used to block radiation from undesired sources, then interference from undesired radiation sources is prevented, but cost, weight, and bulk increase
Solution Approach 1:
The patent extracts the shielding component entirely from the system, replacing it with a computational approach that uses the detector's inherent depth-resolution capability to distinguish desired from undesired radiation sources, thereby eliminating the weight penalty of physical shielding
Solution Approach 2:
The patent replaces the mechanical shielding system with an information-processing system that uses depth information from detected emissions to computationally filter radiation sources, substituting physical blocking with digital discrimination
2Object-affected harmful factors
If shielding is used to block radiation from undesired sources, then interference from undesired radiation sources is prevented, but cost increases
Solution Approach 1:
The patent removes the shielding component from the system design, replacing expensive physical shielding materials with a computational algorithm that leverages the detector's depth-resolution capability to achieve source discrimination without additional material costs
3Object-affected harmful factors
If shielding is used to block radiation from undesired sources, then interference from undesired radiation sources is prevented, but device size increases
Solution Approach 1:
The patent extracts and removes the shielding structure from the detector assembly, replacing it with software-based source discrimination that uses depth information, thereby reducing the overall device volume without compromising the ability to reject undesired radiation
4Object-affected harmful factors
If shielding is used to block radiation, then signal from undesired sources is prevented, but desired signal may be blocked when source location is unknown
Solution Approach 1:
The patent implements a dynamic, adaptive system that uses depth information to identify and track the location of radiation sources in real-time, allowing the system to dynamically adjust which signals are accepted or rejected based on the current source position, thereby preventing desired signal loss
Solution Approach 2:
The patent employs feedback through depth-resolution measurements that provide information about emission origin, allowing the system to continuously refine its understanding of source location and adjust signal acceptance criteria accordingly, ensuring desired signals are not erroneously blocked
5Object-affected harmful factors
If shielding is used to block radiation, then interference is reduced, but device complexity increases
Solution Approach 1:
The patent removes the complex shielding design from the system, replacing it with a computational algorithm that processes depth information from the detector, thereby reducing mechanical design complexity while maintaining or improving interference rejection capability
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 eliminates the need for shielding, reducing cost, weight, and size while accurately determining the direction of radioactive sources, enabling efficient localization and imaging without blocking desired signals.
Implementation Method 1
A 3D spectroscopic detector may be used to detect a direction of a source of radiation
Implementation Method 2
The SPECT system uses a spectroscopic, low spatial resolution detector to localize the Point-of-(first) Interaction (POI) within the detector sensor material in 3D
Data Source
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AI summary
For radioactive source localization, the SPECT system (100) uses a spectroscopic, low spatial resolution detector (108) to localize the Point-of-(first) Interaction (POI) within the detector (108) sensor material in 3D ("3D detector" or "3D spectroscopic detector"), which in turn can be used to estimate (510) the general direction of the source of emissions. By detecting (500) the depth of the 3D POI, and emissions over the specified energy range, a processor (120) may determine (510) a direction towards the source. No shielding is needed as detected emissions from other directions may be discarded. Different shielding (230) may be used to assist in directionality determination, such as different thickness profiles or material type by a side of the detector (108), allowing directional determination by intensity.