X-Ray Inspection Phantom With Variable Attenuation for Bone Detection
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Solution Overview
Problem
Conventional X-ray inspection apparatus calibration methods using phantoms fail to detect changes in detection capability, particularly for products with inhomogeneous internal structures like poultry meat, leading to undetected bone pieces.
Innovation Solution
A phantom made from artificial material with regions of different propagation path lengths, mimicking the product's internal structure, is used to verify the detection capability of X-ray inspection apparatus, incorporating calcium-containing materials to simulate bones and varying thicknesses to test detection limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional phantoms with uniform material composition are used for calibration, then calibration simplicity is maintained, but detection capability verification reliability deteriorates because changes in detection capability remain undetected
Solution Approach 1:
The phantom incorporates regions with different material compositions (bone-equivalent material with different atomic number and density compared to muscle-equivalent material) to locally simulate the inhomogeneous internal structure of poultry meat products. This local quality differentiation enables the phantom to challenge the X-ray apparatus's ability to detect bone pieces in regions with varying attenuation characteristics, thereby improving verification reliability without requiring complex external calibration procedures.
Solution Approach 2:
The phantom is divided into multiple regions with different propagation path lengths and material compositions. By segmenting the phantom into distinct zones (e.g., regions with longer and shorter path lengths through bone-equivalent material), the design creates varied X-ray attenuation scenarios that comprehensively test the detection capability across different product thicknesses and densities, resolving the contradiction between simplicity and reliability.
2Measurement precision
If phantoms mimicking product composition are used, then material similarity is improved, but detection of small bone pieces in high attenuation regions deteriorates because conventional phantoms lack sufficient challenge
Solution Approach 1:
The phantom is designed in advance with predetermined regions of high X-ray attenuation (longer propagation path lengths through bone-equivalent material) and embedded bone pieces of specific sizes and positions. This preliminary structuring ensures that when the X-ray apparatus inspects the phantom, it encounters challenging scenarios similar to actual product inspection, enabling precise measurement of detection capability for small bone pieces in difficult-to-detect regions.
Solution Approach 2:
The phantom utilizes variations in material parameters (atomic number, density) and geometric parameters (propagation path length, bone piece size and position) to create regions with different X-ray attenuation characteristics. By changing these parameters to simulate high attenuation regions, the phantom provides a versatile challenge that tests the apparatus's measurement precision across a range of conditions while maintaining material similarity to actual products.
3Reliability
If calibration is performed at usual time intervals, then operational continuity is maintained, but detection capability changes are not detected leading to undetected bone pieces in products
Solution Approach 1:
The phantom serves as a reference standard with known properties that provides feedback on the X-ray apparatus's detection capability during routine inspections. By comparing the actual detection results against the known bone piece positions and sizes in the phantom, operators can immediately identify changes in detection capability, enabling timely adjustments to maintain food safety reliability without requiring frequent external verification.
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
Enhances the reliability of X-ray inspection apparatus by accurately detecting small bone pieces, even in regions with high X-ray attenuation, ensuring higher safety and consistency in product inspection.
Implementation Method 1
a body is subject to X-rays propagating through the body in an inspection zone of the X-ray inspection apparatus... their path length difference correlating with a difference of measured X-ray attenuation arising between regions of a product sample
Implementation Method 2
incorporating calcium-containing materials to simulate bones and varying thicknesses to test detection limits
Data Source
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AI summary
The invention relates to a method of verifying the detection capability of an X-ray inspection apparatus with respect to a product type of in particular a food product, wherein a body is subject to X-rays propagating through the body in an inspection zone of the X-ray inspection apparatus. According to the invention, the body is a phantom mainly made from artificial material and comprising at least two regions (A, B) with different propagation path lengths, their path length difference correlating with a difference of measured X-ray attenuation arising between regions of a product sample of said product type mimicked by the phantom which regions correspond to said regions (A, B) of the phantom. (Fig. 1)