Nuclear Imaging Detector Array with Asymmetric Light Sensors
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Solution Overview
Problem
Nuclear detectors face challenges in achieving high resolution, particularly at the edges of the detector array, due to the inaccuracy of Anger logic when light is sensed from only one side of a scintillation, and the large number of small light sensors required for improved resolution leads to manufacturing and data readout complexities.
Innovation Solution
A nuclear imaging system with a scintillator and a light-sensitive element array featuring at least two different cross-sectional sizes, including larger and smaller light scanning elements, coupled with a light guide and Anger logic circuitry to accurately determine scintillation locations across the detector array, ensuring uniform resolution from edge to edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the detector size is decreased to improve resolution, then resolution is improved, but the number of light sensors increases leading to manufacturing and data readout problems
Solution Approach 1:
The detector array is segmented into multiple detector sections, each with its own light sensing elements. This allows the system to achieve high resolution through spatial segmentation rather than requiring a single massive array of small sensors, thereby reducing manufacturing and readout complexity while maintaining measurement precision.
Solution Approach 2:
The patent transitions from one-dimensional linear arrays to two-dimensional detector arrays arranged in specific geometric patterns. This dimensional change allows for more efficient light collection and positioning accuracy without proportionally increasing the total number of sensors, thus improving resolution while controlling device complexity.
2Measurement precision
If Anger logic is used to improve resolution beyond light sensor size, then resolution is improved, but accuracy is compromised at adjacent edges where light is sensed from only one side
Solution Approach 1:
The patent implements different detector element configurations at different locations within the detector array. Edge detector sections are designed with specific geometric arrangements that account for the asymmetric light collection characteristics at boundaries, ensuring uniform positioning accuracy across the entire array while maintaining the resolution benefits of Anger logic.
Solution Approach 2:
The detector array uses asymmetric geometric arrangements of light sensing elements, particularly at edge regions, to compensate for the asymmetric light collection patterns that occur at detector boundaries. This asymmetric design maintains measurement accuracy at edges while preserving the high resolution capabilities of the system.
3Measurement precision
If a ring of light sensing elements surrounds each scintillation in the center, then resolution is improved, but the same configuration at edges provides inaccurate location identification
Solution Approach 1:
The patent applies different geometric configurations of light sensing elements for center and edge regions of the detector array. Center regions use symmetric ring arrangements optimized for isotropic light collection, while edge regions use asymmetric configurations that account for boundary effects, ensuring consistent location identification accuracy across the entire detector surface.
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 configuration enhances resolution adjacent to the edges of the detector array, provides uniform resolution across the entire array, simplifies manufacturing, and reduces the complexity of readout channels, achieving improved imaging performance.
Implementation Method 1
a scintillator which converts received radiation into light scintillations
Implementation Method 2
a light sensitive element array which includes light sensing elements
Data Source
AI summary
A detector for a nuclear imaging system includes a scintillator including an array of scintillator elements and a light guide including a grid which defines light guide elements. Light from scintillations in the scintillation crystal in response to received radiation, passes through the light guide and strikes light sensitive elements of a light sensitive element array. The light sensitive element array includes larger elements in an array in the center surrounded by smaller light sensitive elements located in a peripheral array around the central array.