Composite CT Test Article Reducing X-ray Attenuation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing test articles for evaluating image quality of X-ray computed tomography (CT) security-screening systems, such as the Pelican™ Case, are heavy, attenuate x-ray beams, and have structural issues that affect image quality metrics, and lack suitable replacements, leading to challenges in evaluating security screening systems effectively.
Innovation Solution
A system comprising test articles with a molded composite exterior shell assembly and base assembly, featuring a hollow core structure, fiberglass reinforcement, and a resin matrix, designed to minimize x-ray attenuation and weight while enhancing durability, along with specific test objects and a dosimeter assembly for comprehensive image quality evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional test articles (e.g., Pelican Case) are used to evaluate image quality, then structural durability is ensured, but x-ray beam attenuation increases and weight increases
Solution Approach 1:
The test article employs a composite structure consisting of a foam core (polystyrene or polyurethane) surrounded by a thin shell (0.03-0.06 inches thick). This composite design provides structural durability while minimizing x-ray attenuation, as the low-density foam core allows x-ray beams to pass through with minimal interference compared to solid traditional cases.
Solution Approach 2:
The patent utilizes a thin shell structure (0.03-0.06 inches thick) instead of thick rigid walls. This thin-walled construction maintains adequate structural integrity for protecting test objects while significantly reducing x-ray beam attenuation, allowing for better image quality evaluation without compromising basic protective function.
2Strength
If traditional test articles are used, then structural support is provided, but weight increases
Solution Approach 1:
The test article incorporates a foam core structure (polystyrene or polyurethane) which is inherently porous and low-density. This foam material provides adequate structural support and cushioning for test objects while maintaining very low weight, eliminating the need for heavy solid materials traditionally used for structural support.
Solution Approach 2:
The combination of lightweight foam core with a thin protective shell creates a composite structure that achieves sufficient structural strength through material synergy. The foam provides bulk support and shock absorption, while the thin shell provides surface protection, together achieving strength requirements at minimal weight.
3Strength
If thick-walled test articles are used, then structural integrity is improved, but image quality metrics deteriorate due to increased attenuation
Solution Approach 1:
The patent specifies a thin shell thickness of 0.03-0.06 inches, which is sufficient to provide structural integrity and protection for test objects while being thin enough to minimize x-ray attenuation. This thin-walled design ensures that the test article does not interfere with image quality metrics during x-ray CT scanning.
Solution Approach 2:
The composite construction with foam core and thin shell achieves structural integrity through the combined properties of materials rather than relying on wall thickness. The foam provides internal structural support and the thin shell provides external protection, together maintaining integrity while minimizing x-ray interaction.
Data Source
AI summary
A dosimeter assembly being placed within an inner volume of a test article for evaluating an image produced by an x-ray computed tomography (CT) system. The dosimeter assembly includes: a dosimeter having a display, a dosimeter shelf that supports the dosimeter; and an alignment bracket that positions the dosimeter on the dosimeter shelf. The dosimeter shelf is operable to be mounted within the x-ray computed tomography system test article, and the display of the dosimeter is viewable through a dosimeter window which is disposed at a front end of the x-ray computed tomography system test article, wherein the dosimeter assembly is accessible through an access panel directly beneath the dosimeter assembly, the access panel being an opening which is disposed on a base of the x-ray computer tomography system test article. The dosimeter is operably connected to a connection interface which is configured to exchange communication with an external device.