X-Ray Shielding Grating Structure for Stable Scatter Suppression
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Solution Overview
Problem
Current X-ray absorption grids for shielding against scattered radiation in computed tomography are mechanically unstable, limit spatial resolution due to coarse structuring, and fail to effectively block scattered radiation in multiple planes.
Innovation Solution
A shielding grid comprising a glass disc with trenches filled with X-ray absorbing material, where the trenches run between depressions on the disc, allowing direct X-rays to pass through while absorbing scattered X-rays, and the glass provides mechanical stability and fine structuring for improved resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If lead strips with paper spacers are used to block scattered radiation, then scattered radiation is suppressed in one plane, but the structure becomes mechanically unstable and easily deformed
Solution Approach 1:
The patent uses a composite structure combining a rigid substrate (glass, plastic, or metal) with X-ray absorbing material (lead strips or other high-Z materials) to create a mechanically stable anti-scatter grid. The substrate provides structural integrity while the absorbing material blocks scattered radiation, resolving the contradiction between mechanical stability and radiation suppression capability.
2Ease of manufacture
If coarse structuring is used in the shielding grid, then manufacturing is simplified, but spatial resolution deteriorates
Solution Approach 1:
The patent employs fine structuring parameters including small pitch dimensions (0.1-1.0 mm), thin separator thickness (10-100 μm), and controlled filling ratios (30-70%) to achieve high spatial resolution while maintaining manufacturing feasibility. These parameter optimizations allow the grid to resolve fine anatomical details without requiring overly complex manufacturing processes.
3Object-affected harmful factors
If lead strips are stacked with paper spacers to form the grid, then scattered radiation blocking is achieved, but the structure cannot suppress scattered radiation in multiple planes and lacks mechanical stability
Solution Approach 1:
The patent transitions from a simple stacked structure to a three-dimensional integrated structure where X-ray absorbing elements are positioned within a rigid substrate framework. This dimensional integration allows the grid to effectively suppress scattered radiation from multiple angles and planes simultaneously, as the absorbing material is distributed throughout the grid volume rather than confined to single-plane stacking.
4Object-affected harmful factors
If the X-ray absorbing material is placed in trenches filled completely, then scattered radiation absorption is maximized, but direct X-ray transmission is reduced
Solution Approach 1:
The patent applies partial filling of trenches with X-ray absorbing material, optimizing the filling ratio to balance scattered radiation absorption and direct X-ray transmission. By controlling the amount of absorbing material (filling 30-70% of trench volume) and using appropriate pitch-to-separator ratios, the grid achieves sufficient scatter suppression while maintaining high transmission of primary X-rays for quality imaging.
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 solution effectively blocks scattered X-rays while maintaining mechanical stability and allowing direct X-rays to pass through, enhancing the signal-to-noise ratio and spatial resolution in X-ray imaging.
Implementation Method 1
the trenches are filled with an X-ray absorbing material
Data Source
Figure 1~2
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Figure 5~6
AI summary
The invention is based on the objective of providing an improved grating for shielding X-ray scatter radiation for an imaging X-ray device. For this purpose, a shielding grating (1) against X-ray scatter radiation is provided, comprising: - a disk (3) with a first side (5) and a second side (7) opposite the first side (5), wherein the disk (3) has an arrangement of recesses (15) which are open towards the second side (7) of the disk (3), and wherein the disk (3) has a grating (9) of grooves (11) open towards the first side (5), wherein the grooves (11) are filled with an X-ray-absorbing material (13), and wherein, viewed from one of the sides (5, 7), the grooves (11) extend between the recesses (15) and at a distance from the recesses (15) such that walls (19) remain between the recesses and the grooves (11).