Scintillator-Embedded Charge Generation Layer for X-Ray Detectors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current x-ray radiation imaging technologies face challenges with image sharpness due to light scattering in indirect conversion methods and high production complexity and cost of direct conversion materials like amorphous selenium, which has a low x-ray absorption coefficient for energies above 40 keV.
Innovation Solution
A novel composition for radiation imaging detectors comprising an organic matrix with scintillating particles dispersed in it, where the scintillating particles are coated with a charge generation material, providing effective x-ray absorption and conversion to electrical charges, potentially using materials like Gadolinium Oxysulfide and charge transport materials like Triphenylamine Dimer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If indirect conversion method is used, then light scattering occurs before reaching photo sensors, but production complexity and cost are reduced
Solution Approach 1:
The invention divides the detection process into two separate functional components: scintillating particles for radiation-to-light conversion and charge generation material for light-to-charge conversion. This segmentation allows each component to be optimized independently, with scintillating particles handling radiation absorption and charge generation material handling charge creation, thereby eliminating light scattering issues while maintaining manufacturing simplicity.
Solution Approach 2:
The invention introduces charge generation material as an intermediary substance between scintillating particles and photo sensors. This intermediary converts scintillating light into electrical charges locally at the particle site, preventing light from traveling through the medium and scattering, thus preserving image sharpness while keeping the system manufacturable.
2Measurement precision
If direct conversion using amorphous selenium is used, then resolution is significantly higher, but production complexity and cost increase
Solution Approach 1:
The invention uses a composite material system combining scintillating particles (for high x-ray absorption) and charge generation material (for efficient charge conversion). This composite approach achieves direct conversion-like resolution by converting light to charges locally at each particle site, while avoiding the manufacturing complexity of producing uniform amorphous selenium layers.
Solution Approach 2:
The invention implements local charge conversion by coating each scintillating particle with charge generation material. This local quality approach ensures that charge generation occurs precisely where light is produced, eliminating the need for thick uniform selenium layers and reducing production complexity while maintaining high resolution.
3Use of energy by moving object
If amorphous selenium is used, then direct conversion is achieved, but x-ray absorption coefficient is low for energies above 40 keV
Solution Approach 1:
The invention changes the material composition parameters by selecting scintillating particles with high atomic number elements (such as gadolinium, barium, or lead compounds) that have high x-ray absorption coefficients for energies above 40 keV. This parameter change enables efficient high-energy x-ray absorption without requiring thick layers, thereby reducing production complexity.
Solution Approach 2:
The invention transitions from using a single material (amorphous selenium) to a multi-material composite system where scintillating particles provide high-energy x-ray absorption and charge generation material provides efficient charge conversion. This dimensional change in material composition enables simultaneous achievement of high absorption coefficient and low production complexity.
4Ease of manufacture
If organic photoconductor materials are used, then production complexity is reduced, but x-ray absorption coefficient is very low
Solution Approach 1:
The invention creates a composite material system where scintillating particles (containing high atomic number elements) provide high x-ray absorption coefficient, while the organic charge generation material provides ease of manufacture. This composite approach combines the advantages of both material types, achieving high energy absorption without sacrificing manufacturing simplicity.
Solution Approach 2:
The invention uses scintillating particles as an intermediary that absorbs x-rays and converts them to light, which is then converted to charges by the organic charge generation material. This intermediary approach enables organic materials to achieve high x-ray absorption coefficients by delegating the absorption function to high-Z scintillating particles while maintaining the manufacturing advantages of organic materials.
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 composition achieves high spatial resolution and low noise by local conversion of scintillating light to electrical charges, comparable to direct conversion semiconductor imaging, with adjustable radiation absorption efficiency and reduced scattering, thus improving image quality and reducing production complexity.
Implementation Method 1
scintillating particles for absorbing radiation
Implementation Method 2
charge generation material (CGM)... generating electrical charges proportional to the x-ray energy
Implementation Method 3
an organic matrix comprising a charge transport material (CTM)
Data Source
AI summary
Disclosed is a novel composition for radiation image detector. The composition comprises an organic matrix comprising a charge transport material (CTM); and scintillating particles for absorbing radiation, being dispersed in the organic matrix, wherein the scintillating particles are in contact with a charge generation material (CGM).