Nucleus Detector Light Guide Slits for Spatial Resolution
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Solution Overview
Problem
Existing nuclear detectors face challenges such as high costs, low system integration flexibility, and limited spatial resolution, particularly in PET systems where high spatial resolution is crucial for imaging fine tissues.
Innovation Solution
A nuclear detector design featuring a scintillation crystal array with closely arranged crystal bars, a light guide with slits, and a photodetector array of silicon photomultipliers (SiPMs), where the SiPMs have a larger cross-sectional area than the crystal bars, allowing for high spatial resolution without direct 1:1 coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PSPMT is coupled with scintillation crystal array to achieve high spatial resolution, then spatial resolution is improved, but device cost increases and system integration flexibility decreases
Solution Approach 1:
A light guide is introduced as an intermediary component between the scintillation crystal array and the SiPM array. The light guide enables optical coupling while allowing the SiPMs to have a larger cross-sectional area than the crystal bars, achieving high spatial resolution without requiring 1:1 direct coupling. This intermediary structure resolves the contradiction by decoupling the size constraints of the photodetectors from the crystal bar dimensions.
Solution Approach 2:
The patent uses SiPMs as a cost-effective and flexible alternative to expensive PSPMTs. SiPMs can be arranged in arrays with larger individual element sizes, providing similar or superior performance at lower cost and with better integration flexibility. This copying approach replaces the problematic PSPMT technology with a more suitable photodetector technology.
2Measurement precision
If crystal bars are cut into size less than 2.0 mm to achieve high spatial resolution, then spatial resolution is improved, but manufacturing complexity increases
Solution Approach 1:
The scintillation crystal array is segmented into multiple small crystal bars with dimensions less than 2.0 mm, arranged in a close-packed configuration. This segmentation enables high spatial resolution by providing fine sampling of the radiation field. The light guide with slits further segments the optical paths, allowing each SiPM to receive light from specific crystal bars, thereby achieving high resolution without requiring extremely small photodetectors.
3Reliability
If 1:1 direct coupling of SiPM array with scintillation crystal array is used, then energy resolution and time resolution are improved, but spatial resolution is limited by SiPM size
Solution Approach 1:
The patent transitions from direct 1:1 coupling in a single dimension to a multi-dimensional coupling scheme using a light guide with slits. The light guide introduces an additional optical dimension, allowing SiPMs with larger cross-sectional areas to effectively detect light from smaller crystal bars. This dimensional change enables the system to achieve high spatial resolution while maintaining good energy and time resolution, as the SiPMs are not constrained to 1:1 correspondence with crystal bars.
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 design achieves high spatial resolution with minimal scintillation photon loss, maintaining a high signal-to-noise ratio and facilitating cost-effective production, while also improving system integration flexibility.
Implementation Method 1
a scintillation crystal array including a plurality of scintillation crystal bars of the same size arranged closely in sequence
Implementation Method 2
a photodetector array including a plurality of silicon photomultipliers (SiPMs) arranged in sequence
Data Source
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AI summary
Disclosed is a nuclear detector, comprising a scintillation crystal array (10) including a plurality of scintillation crystal bars (11) of the same size arranged closely and in sequence, a light guide (20), and a photodetector array (30) including a plurality of photodetectors arranged in sequence. The photodetectors have a cross-sectional area greater than that of the scintillation crystal bars (11), and the light guide (20) includes a top surface coupled to the scintillation crystal array (10), an opposed bottom surface coupled to the photodetector array (30) and a side surface. The light guide (20) has a thickness in a range of 0.1mm to 40mm. The light guide (20) further includes a slit (22, 23) adjacent to an edge of the light guide (20), and the slit (22, 23) is configured to extend from the top surface toward the bottom surface of the light guide (20) and the slit (22, 23) has a depth in a range of 0.1 to 0.5 times the thickness of the light guide (22, 23).