Monolithic Scintillator with Laser-Induced Barriers for CT Detectors
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Solution Overview
Problem
The existing CT detector arrays face challenges in accurately aligning and stacking scintillator layers, leading to detection inefficiencies and degraded image quality due to complex alignment processes.
Innovation Solution
A monolithic scintillator with optically reflective barriers induced by lasers is used, maintaining the physical bulk of scintillator material while separating regions, which simplifies the alignment process and improves detection efficiency by minimizing light cross-talk and directing light to corresponding photosensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate scintillator layers are stacked and aligned, then multi-energy detection capability is achieved, but alignment complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges multiple separate scintillator layers into a single monolithic scintillator block. The block is internally segmented into multiple detection layers using laser-induced optically reflective barriers, eliminating the need to physically stack and align separate scintillator pieces. This maintains the multi-energy detection capability while dramatically reducing alignment complexity and manufacturing difficulty.
2Object-affected harmful factors
If scintillator layers are physically separated and stacked, then light cross-talk between layers can be reduced, but detection efficiency decreases due to air gaps and alignment issues
Solution Approach 1:
The patent introduces laser-induced optically reflective barriers as intermediaries within the monolithic scintillator block. These barriers, created by modifying the crystal structure through laser processing, serve as light-reflecting interfaces between detection layers without requiring physical separation. This eliminates air gaps that reduce detection efficiency while still preventing light cross-talk between layers, thereby improving both light isolation and detection efficiency simultaneously.
3Manufacturing precision
If a monolithic scintillator block is used with internal barriers, then alignment precision is improved, but manufacturing complexity increases due to laser processing requirements
Solution Approach 1:
The patent replaces mechanical alignment and physical stacking processes with laser-based internal barrier creation. Instead of mechanically assembling multiple scintillator pieces with precise alignment, the invention uses laser processing to create optically reflective barriers directly within a single monolithic block. This substitution of mechanical assembly with laser processing actually simplifies manufacturing by eliminating the need for complex alignment fixtures and multi-step assembly procedures.
4Ease of operation
If multiple separate scintillator pieces are stacked, then light can be directed to corresponding photosensors, but the stacking process becomes time-consuming and reduces productivity
Solution Approach 1:
The patent combines multiple separate scintillator pieces into a single monolithic block that contains all detection layers. The laser-induced internal barriers within the block provide the necessary optical separation and light direction functionality that would otherwise require multiple stacked pieces. This merging approach maintains the ability to direct light to corresponding photosensors while dramatically reducing the number of assembly steps and improving manufacturing productivity.
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 enhances the alignment and stacking of scintillator layers, improving detection efficiency and image quality by maintaining the physical bulk of scintillator material and reducing the complexity of the alignment process.
Implementation Method 1
a crystal structure of a portion of the scintillator material has been altered by a laser to define the plurality of regions in scintillator material for each voxel
Implementation Method 2
The same physical bulk of scintillator material converts the x-ray radiation into light radiation
Implementation Method 3
an optically reflective barrier therebetween
Data Source
Figure 1
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Figure 2B
AI summary
A computed tomography (CT) detector array (120) includes a monolithic scintillator (124). The monolithic scintillator includes at least a first scintillator region (202), a second scintillator region (206), and an optically reflective barrier (210) therebetween. The detector array is configured to detect X-ray radiation traversing an examination region and impinging the monolithic scintillator and generate first projection data indicative of an energy of x-ray radiation absorbed by the first scintillator region and second projection data indicative of an energy of x-ray radiation traversing the first scintillator and absorbed by the second scintillator region.