Stacked-Layer Test Phantom for Uniform Electromagnetic Image Evaluation
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Solution Overview
Problem
Conventional test phantoms for evaluating electromagnetic radiation images are limited in assessing contrast and detail resolution uniformly across different directions, require complex manufacturing, and are inefficient in evaluating image quality under uneven radiation conditions.
Innovation Solution
A test phantom with stacked layer bodies and recess portions symmetrically arranged in a ring array, allowing simultaneous evaluation of image quality indicators, including contrast, detail, and uniformity, using a metal ring for enhanced resolution assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional phantoms use non-symmetric arrangements of evaluation features, then manufacturing is simpler, but they fail to evaluate detail resolution effectively under uneven directional electromagnetic radiation conditions
Solution Approach 1:
The patent applies asymmetry in reverse by using symmetric arrangements (ring arrays and radial symmetry) to compensate for the asymmetric nature of uneven directional electromagnetic radiation. This allows the phantom to evaluate detail resolution effectively under non-uniform radiation conditions while maintaining manufacturing feasibility through standardized circular geometries.
Solution Approach 2:
The patent transitions from evaluating only central region resolution to evaluating both central and peripheral regions by incorporating ring arrays at multiple radii. This dimensional expansion from center-only to concentric ring structures enables comprehensive evaluation across the entire image field under uneven radiation conditions.
2Measurement precision
If conventional phantoms evaluate only the central region, then the structure is simpler, but the contrast resolution measurement becomes distorted and resolution decreases as evaluation moves from the emission center
Solution Approach 1:
The patent expands the evaluation from a single central point to multiple concentric rings at different radii, enabling assessment of contrast resolution across the entire image field including peripheral regions. This multi-radial arrangement captures the variation in resolution from center to periphery under uneven radiation conditions.
Solution Approach 2:
The phantom divides the evaluation area into multiple segmented ring regions at different radii from the center. Each ring serves as an independent evaluation zone, allowing separate measurement of contrast resolution at different distances from the emission center, thereby identifying resolution degradation patterns.
3Measurement precision
If conventional phantoms use fillers with varying densities and diameters, then detail resolution can be evaluated, but the requirements for manufacturing precision increase
Solution Approach 1:
The patent varies the radial length of recess portions at different radial positions from the center, with each radial position having its own characteristic recess dimensions. This local differentiation enables detail resolution evaluation specific to each evaluation zone while using uniform recess depth, simplifying manufacturing compared to varying multiple parameters.
4Adaptability or versatility
If conventional phantoms require frequent adjustments of shielding members, then evaluation flexibility is improved, but measurement convenience and efficiency deteriorate
Solution Approach 1:
The patent pre-arranges multiple evaluation features (ring arrays with recess portions) at different radial positions and orientations within the phantom structure before measurement. This preliminary configuration eliminates the need for frequent adjustments during measurement, as all evaluation zones are simultaneously accessible and properly positioned for comprehensive assessment.
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
Enables precise evaluation of image quality indicators across all directions, simplifies manufacturing, and reduces deviations in image quality assessment by ensuring uniformity and accuracy in contrast and detail resolution measurements.
Implementation Method 1
The recess portions located on different layer bodies cause different degrees of attenuation to electromagnetic radiation passing therethrough
Data Source
AI summary
A test phantom for evaluating electromagnetic radiation images is adapted for solving the problem of high requirement of manufacturing precision for detail evaluation portions formed by concave portions in the conventional phantom. The test phantom includes a plurality of layer bodies and a plurality of recess portions. The plurality of layer bodies is stacked one upon another to form stacked layer bodies. An area of each of the plurality of layer bodies gradually increases from top to bottom of the stacked layer bodies, and each of the plurality of layer bodies has an exposed region on an upper surface thereof. The plurality of recess portions is formed by recessing the exposed regions of the upper surfaces of at least two of the plurality of layer bodies. The recess portions located on different layer bodies cause different degrees of attenuation to electromagnetic radiation passing therethrough.