Active-Partition Gamma Detector for Overlap-Free Wide-FOV Imaging
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Solution Overview
Problem
Existing gamma cameras suffer from low sensitivity due to overlap and multiplexing issues, leading to image noise and artifacts, and existing solutions either introduce truncation or have limited field of view (FOV).
Innovation Solution
A device with active partitions that act as collimators and detectors, preventing overlap by measuring gamma ray impact coordinates, ensuring high sensitivity and resolution without truncation, using dense materials like Pb or W to block overlapping paths and reflective surfaces to guide photons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a whole active detector is used, then the detection capability is sufficient, but the device complexity and cost increase significantly
Solution Approach 1:
The detector is divided into multiple independent active segments (first active segment, second active segment, etc.) that can be separately manufactured and positioned. Each segment contains its own scintillator crystal and photodetector, allowing modular assembly that reduces overall system complexity while maintaining detection capability through the combined active area of all segments.
2Device complexity
If passive partitions are used to separate active segments, then device complexity is reduced, but gamma ray detection accuracy deteriorates due to insufficient segmentation
Solution Approach 1:
The partition structure is optimized with different properties in different regions: the first partition is positioned between the first and second active segments with specific geometric characteristics (first height, first distance from first axis) that differ from the second partition's characteristics (second height, second distance from second axis). This local differentiation allows each partition to optimally serve its specific spatial context, improving gamma ray detection accuracy while maintaining manageable device complexity.
3Area of stationary object
If active segments are positioned close together, then the device size is reduced, but the segmentation effectiveness decreases
Solution Approach 1:
The partition design utilizes vertical dimensionality by extending partitions from the base plate upward to specific heights (first height, second height) rather than relying solely on horizontal spacing. This vertical segmentation allows active segments to be positioned closer horizontally while maintaining effective segmentation through the vertical barrier provided by the partitions, thus reducing overall device footprint while preserving segmentation effectiveness.
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 device achieves high-resolution imaging with a large FOV by eliminating overlap and artifacts, maintaining high sensitivity and preventing image truncation, allowing accurate image reconstruction.
Implementation Method 1
Each of the first and second active segments includes a scintillator crystal and a photodetector
Implementation Method 2
Each of the first and second active segments includes a scintillator crystal and a photodetector
Data Source
Figure 1~2
Figure 3a~3b
Figure 4~6
AI summary
The invention relates to a device for the detection of gamma rays (1) coming from a source (2) without image truncation and without image overlaping, comprising, at least, two detection cells (3) and each of said cells comprising a detection space (7) adapted to receive the gamma rays (1) that penetrate through an opening (5), wherein said detection space (7) comprises one or more detection assemblies (8, 8'), with some of said assemblies (8') being positioned such that they stand in the way of the gamma rays (1) coming into the overlap volume (11) thereof.