X-ray Phase Contrast Imaging Grating Arrangement
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Solution Overview
Problem
Existing X-ray phase contrast imaging apparatuses face difficulties in determining the arrangement of gratings when using an X-ray source that radiates continuous X-rays, as the mathematical formulas require specific wavelength information which is not applicable in such cases.
Innovation Solution
The X-ray phase contrast imaging apparatus is arranged with an X-ray source, a first grating, and a second grating, where the gratings are positioned to satisfy specific geometric and noise-reducing conditions, allowing for the determination of their arrangement without relying on the wavelength of the X-ray source, and a third grating is optionally added to increase coherence and form multiple self-images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an X-ray source that radiates continuous X-rays is used, then the imaging capability is enhanced, but it becomes impossible to determine the arrangement of gratings because wavelength information is unavailable
Solution Approach 1:
The patent changes the approach from wavelength-dependent parameter substitution to wavelength-independent geometric relationships. By formulating grating arrangement conditions based on geometric parameters (distances R1, R2 and pitches d1, d2) rather than wavelength-dependent formulas, the system becomes adaptable to continuous X-ray sources while maintaining deterministic grating arrangement capability.
2Manufacturing precision
If the arrangement of gratings is determined using mathematical formulas requiring wavelength substitution, then precise grating positioning is achieved, but the method cannot be applied when using continuous X-rays without known wavelength
Solution Approach 1:
The patent transforms the problem by replacing wavelength-dependent parameters with wavelength-independent geometric parameters. The grating arrangement conditions are expressed solely in terms of distances (R1, R2) and pitches (d1, d2), eliminating the need for wavelength information and enabling precise positioning with continuous X-ray sources.
3Measurement precision
If the pitch of the self-image of the first grating does not match the pitch of the second grating, then the imaging geometry is suboptimal, but adjusting the arrangement requires wavelength information that is unavailable with continuous X-rays
Solution Approach 1:
The patent resolves the matching requirement by formulating geometric conditions that directly relate the pitches and distances without requiring wavelength information. The condition R1:d1=R:d2 ensures proper geometric matching of the self-image pitch with the second grating pitch through wavelength-independent parameter relationships.
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
This arrangement enables the determination of grating positions suitable for imaging, reduces noise, and results in high-visibility captured images even when using continuous X-rays.
Implementation Method 1
a first grating irradiated with the continuous X-rays from the X-ray source to form a self-image
Implementation Method 2
a second grating irradiated with the continuous X-rays that have passed through the first grating
Data Source
AI summary
This X-ray phase contrast imaging apparatus (100) includes an X-ray source (1) that radiates continuous X-rays, a first grating (3) that forms a self-image, a second grating (4), a detector (5) that detects the continuous X-rays, and a third grating (2) arranged between the detector (5) and the first grating 3. The first grating (3), the second grating (4), and the third grating (2) are arranged so as to satisfy conditions of predetermined formulas.