Metallic Substrate Computed Radiography Imaging Plates
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Solution Overview
Problem
Conventional computed radiography (CR) imaging plates with plastic substrates suffer from interference and reduced resolution due to luminescence from the substrate, especially at higher-energy x-ray applications, limiting the effectiveness of intensifying screens and increasing patient radiation exposure.
Innovation Solution
A CR imaging plate design featuring a metallic substrate coupled with the phosphor layer, allowing intimate contact and acting as a secondary scatter filter, and optionally interspersing metallic compounds within the phosphor layer to enhance resolution and reduce radiation dose, using metals like lead, copper, or tungsten for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plastic substrate is used in conventional CR imaging plates, then the plate provides structural support and flexibility, but the substrate causes luminescence interference and reduced resolution, especially at higher-energy x-ray applications
Solution Approach 1:
The patent changes the fundamental material parameter of the substrate from plastic to metallic (lead, copper, or aluminum). This material substitution eliminates the luminescence interference that plagues plastic substrates while maintaining the necessary structural support. The metallic substrate provides the same mechanical function without the harmful optical properties that reduce image resolution.
Solution Approach 2:
The patent creates a composite structure by combining the metallic substrate with the phosphor layer and protective overcoat. This composite design allows the metallic substrate to provide structural support while the phosphor layer captures x-rays, and the protective overcoat maintains flexibility and handling properties. The composite structure resolves the contradiction by distributing functions across different materials.
2Device complexity
If a plastic substrate is used in conventional CR imaging plates, then the plate construction is simple and conventional, but the substrate increases patient radiation exposure due to luminescence interference
Solution Approach 1:
The patent changes the substrate material parameter from plastic to metal, which fundamentally alters the interaction with x-ray radiation. The metallic substrate does not produce luminescence interference, thereby reducing the radiation dose required to achieve diagnostic image quality. This parameter change directly addresses the harmful effect on patients.
3Ease of manufacture
If conventional plastic substrates are used, then manufacturing processes are well-established, but the substrates cause interference that limits the effectiveness of intensifying screens
Solution Approach 1:
The patent changes the substrate material from plastic to metal, which eliminates the luminescence that interferes with intensifying screen performance. This parameter change allows intensifying screens to function at their full potential, improving their effectiveness without requiring changes to the manufacturing process itself.
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 metallic substrate enhances resolution, reduces specimen exposure, and improves image quality by minimizing substrate interference, achieving lower radiation doses and better image fidelity.
Implementation Method 1
These imaging plates include a photostimulable phosphor layer, which converts radiation into a latent image
Implementation Method 2
A CR imaging plate design featuring a metallic substrate coupled with the phosphor layer, allowing intimate contact and acting as a secondary scatter filter
Implementation Method 3
This image is retrieved using a laser-catalyzed photoemission phosphor layer
Implementation Method 4
The imaging plate is erased with light to remove any remaining latent image that was not retrieved by the laser
Data Source
AI summary
Computed radiography imaging plates incorporating an intensifying material that is coupled to or intermixed with the phosphor layer, allowing electrons and/or low energy x-rays to impart their energy on the phosphor layer, while decreasing internal scattering and increasing resolution. The radiation needed to perform radiography can also be reduced as a result.