CT Detector Ray Absorber for Gap Scattering
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Solution Overview
Problem
Existing CT imaging equipment suffers from artifacts in the final reconstructed image due to high-frequency scattering caused by gaps between detection modules, where pixel units proximate to these gaps receive uneven X-ray exposure, leading to distorted image reconstruction.
Innovation Solution
A CT detector with a ray absorber made of high atomic number material is placed at the X-ray incidence end of the gaps between detection modules, effectively shielding these gaps and reducing high-frequency scattering by absorbing X-rays, thereby preventing artifacts in the reconstructed image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If detection modules are assembled manually to form CT detector, then the pixel units within each module have small and identical gaps, but large and variable gaps are formed between adjacent detection modules, causing high-frequency scattering and image artifacts
Solution Approach 1:
A ray absorber made of high atomic number material is introduced as an intermediary component between adjacent detection modules. This ray absorber fills the large gaps formed during manual assembly and absorbs scattered X-rays, preventing them from reaching pixel units and causing artifacts, while maintaining the modular assembly structure
Solution Approach 2:
The ray absorber is strategically positioned only at specific locations where gaps between detection modules occur, rather than uniformly across the entire detector. This localized approach addresses the harmful scattering effect at critical interfaces while preserving the overall detector structure and performance
2Reliability
If gaps between detection modules are reduced to eliminate scattering, then image quality improves, but the modular assembly structure and manual assembly process become more difficult to implement
Solution Approach 1:
The ray absorber serves as a mediator that enables the modular assembly approach to work effectively. It compensates for the gaps inherent in manual assembly, allowing detectors to maintain both modular construction benefits and high image quality by absorbing scattered radiation at module interfaces
3Object-affected harmful factors
If ray absorber made of high atomic number material is added to shield gaps, then scattered X-rays are effectively absorbed and artifacts are reduced, but device complexity and manufacturing cost increase
Solution Approach 1:
The ray absorber is a simple intermediary component that can be integrated into the existing modular detector structure. It adds minimal complexity by being placed only at gap locations between modules, rather than requiring a complete redesign of the detector architecture
Solution Approach 2:
The ray absorber is applied locally only where needed at the interfaces between detection modules, rather than throughout the entire detector. This localized application minimizes the addition of materials and structural complexity while effectively addressing the scattering problem at critical locations
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 use of a high atomic number ray absorber effectively reduces high-frequency scattering and prevents annular artifacts in the final reconstructed image, improving image quality by ensuring uniform X-ray exposure across pixel units.
Implementation Method 1
The ray absorber is made of a material of high atomic number... effectively shielding these gaps and reducing high-frequency scattering by absorbing X-rays
Data Source
AI summary
The present disclosure provides a computed tomography (CT) detector, including at least two detection modules and a ray absorber. A gap is formed between each two adjacent detection modules. The ray absorber is arranged in the gap or arranged at an X-ray-incidence end of the gap. The ray absorber is made of a material of high atomic number.